U.S. patent number 10,532,976 [Application Number 15/853,653] was granted by the patent office on 2020-01-14 for fto inhibitors.
This patent grant is currently assigned to National Institute of Biological Sciences, Beijing. The grantee listed for this patent is National Institute of Biological Sciences, Beijing. Invention is credited to Niu Huang, Shiming Peng.
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United States Patent |
10,532,976 |
Huang , et al. |
January 14, 2020 |
FTO inhibitors
Abstract
The invention provides compounds that inhibit FTO (fat mass and
obesity), including pharmaceutically acceptable salts, hydrides and
stereoisomers thereof. The compounds are employed in pharmaceutical
compositions, and methods of making and use, including treating a
person in need thereof, particularly obesity, with an effective
amount of the compound or composition, and detecting a resultant
improvement in the person's health or condition.
Inventors: |
Huang; Niu (Beijing,
CN), Peng; Shiming (Beijing, CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
National Institute of Biological Sciences, Beijing |
Beijing |
N/A |
CN |
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Assignee: |
National Institute of Biological
Sciences, Beijing (Beijing, CN)
|
Family
ID: |
62019791 |
Appl.
No.: |
15/853,653 |
Filed: |
December 22, 2017 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20180118665 A1 |
May 3, 2018 |
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Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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PCT/CN2016/086340 |
Jun 20, 2016 |
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PCT/CN2015/082052 |
Jun 23, 2015 |
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15853653 |
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PCT/CN2016/111524 |
Dec 22, 2016 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C07D
237/14 (20130101); C07D 285/08 (20130101); A61P
25/28 (20180101); C07D 235/08 (20130101); C07D
277/56 (20130101); C07D 231/14 (20130101); C07D
239/36 (20130101); C07D 307/46 (20130101); C07D
213/57 (20130101); C07D 241/12 (20130101); C07D
241/20 (20130101); C07D 241/52 (20130101); C07D
471/04 (20130101); C07D 277/24 (20130101); C07D
209/08 (20130101); C07D 295/185 (20130101); C07D
277/30 (20130101); C07D 213/80 (20130101); C07D
261/08 (20130101); C07D 239/42 (20130101); C07C
255/34 (20130101); C07D 241/24 (20130101); C07D
249/08 (20130101); C07D 249/12 (20130101); C07D
257/04 (20130101); A61P 3/04 (20180101); C07D
487/04 (20130101); C07D 213/75 (20130101); C07D
239/26 (20130101); C07D 277/46 (20130101); C07D
277/64 (20130101); C07C 255/43 (20130101); C07D
233/56 (20130101); C07D 211/82 (20130101); C07D
251/16 (20130101); C07D 261/12 (20130101); C07D
215/233 (20130101) |
Current International
Class: |
C07C
255/34 (20060101); C07D 241/24 (20060101); C07D
251/16 (20060101); C07D 241/52 (20060101); C07D
471/04 (20060101); C07D 213/80 (20060101); C07D
241/20 (20060101); C07D 285/08 (20060101); C07D
295/185 (20060101); C07D 241/12 (20060101); C07D
249/08 (20060101); C07D 261/12 (20060101); C07D
239/42 (20060101); C07D 215/233 (20060101); C07D
277/56 (20060101); C07D 249/12 (20060101); C07D
211/82 (20060101); C07D 487/04 (20060101); C07D
235/08 (20060101); C07D 231/14 (20060101); C07D
209/08 (20060101); C07D 239/26 (20060101); C07D
233/56 (20060101); C07D 277/24 (20060101); C07D
261/08 (20060101); C07D 307/46 (20060101); C07D
257/04 (20060101); C07D 213/75 (20060101); C07D
277/64 (20060101); C07C 255/43 (20060101); C07D
277/46 (20060101); C07D 277/30 (20060101); A61P
3/04 (20060101); A61P 25/28 (20060101); C07D
213/57 (20060101); C07D 237/14 (20060101); C07D
239/36 (20060101) |
Field of
Search: |
;514/653 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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WO-2008100977 |
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Aug 2008 |
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WO |
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WO-2008119793 |
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Oct 2008 |
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WO |
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WO-2014164667 |
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Oct 2014 |
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WO |
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WO-2016206573 |
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Dec 2016 |
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WO |
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WO-2018036498 |
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Mar 2018 |
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WO |
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WO-2018036501 |
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Mar 2018 |
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WO |
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WO-2019129121 |
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Jul 2019 |
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WO |
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Other References
International Preliminary Report on Patentability Issued in
International Application PCT/CN2016/086340, dated Dec. 26, 2016 .
(Year: 2016). cited by examiner .
Zhou; Bioorganic & Medicinal Chemistry Letters 19 (2009)
1861-1865. (Year: 2009). cited by examiner .
Lotta; Journal of Computer-Aided Molecular Design, 6 (1992)
253-272. (Year: 1992). cited by examiner .
Bonifacio; CNS Drug Reviews, 2007, 13, 352-379. (Year: 2007). cited
by examiner .
Fawcett; Trends in Genetics 2010, 26, 266-274. (Year: 2010). cited
by examiner .
Frayling; Science 2007, 316, 889-894. (Year: 2007). cited by
examiner .
Guh; BMC Public Health 2009, 9, 88. (Year: 2009). cited by examiner
.
Keller; Journal of Alzheimer's Disease 2011, 23, 461-469. (Year:
2011). cited by examiner .
"Effect of Entacapone on Bodyweight Loss in Obese Population",
ClinicalTrials.gov Identifier: NCT02349243 (Jan. 28, 2015).
Downloaded from https://clinicaltrials.gov/ct2/show/NCT02349243 on
Oct. 17, 2019. (Year: 2015). cited by examiner .
Di Giovanni; J Biol Chem. 2010, 285, 14941-14954. (Year: 2010).
cited by examiner.
|
Primary Examiner: Carcanague; Daniel R
Attorney, Agent or Firm: Osman; Richard Aron
Claims
What is claimed is:
1. A pharmaceutical composition comprising an FTO inhibitor
selected from a compound formula I, a stereoisomer thereof, a
hydrate thereof, and a pharmaceutically-acceptable salt thereof,
and a pharmaceutically-acceptable excipient, formulated in a unit
dosage form, and suitable for administration to a person in need
thereof, the inhibitor of structure: ##STR00197## wherein: (a) R1
and R2 are independently H or Me; R3 is OH or NHR, wherein R is H
or an optionally substituted, optionally hetero-, optionally cyclic
C1-C18 hydrocarbyl; and R4 is optionally substituted, optionally
hetero-, optionally cyclic C1-C18 hydrocarbyl; (b) R1 and R2 are
independently H or Me; R3 is OH or NHR, wherein R is H or C1-C4
alkyl; R4 is CONHR5; and R5 is optionally substituted, optionally
hetero-, optionally cyclic C1-C18 hydrocarbyl; (c) R1 and R2 are
independently H or Me; R3 is OH or NHR, wherein R is H or C1-C4
alkyl; R4 is COR5; and R5 is optionally substituted, heterocyclic
C3-C18 hydrocarbyl comprising an n-membered ring wherein n=3-18,
including 1 to n-1 heteroatoms independently selected from N, O, S
and P; or (d) R1 and R2 are independently H or Me; R3 is OH or NHR,
wherein R is H or C1-C4 alkyl; and R4 is optionally substituted,
heterocyclic C3-C18 hydrocarbyl comprising an n-membered ring
wherein n=3-18, including 1 to n-1 heteroatoms independently
selected from N, O, S and P.
2. The composition of claim 1 wherein: R1 and R2 are independently
H or Me; R3 is OH or NHR, wherein R is H or an optionally
substituted, optionally hetero-, optionally cyclic C1-C18
hydrocarbyl; and R4 is optionally substituted, optionally hetero-;
optionally cyclic C1-C18 hydrocarbyl.
3. The composition of claim 1 wherein: R1 and R2 are independently
H or Me; R3 is OH or NHR, wherein R is H or C1-C4 alkyl; R4 is
CONHR5; and R5 is optionally substituted, optionally hetero-,
optionally cyclic C1-C18 hydrocarbyl.
4. The composition of claim 1 wherein: R1 and R2 are independently
H or Me; R3 is OH or NHR, wherein R is H or C1-C4 alkyl; R4 is
COR5; and R5 is optionally substituted, heterocyclic C3-C18
hydrocarbyl comprising an n-membered ring wherein n=3-18, including
1 to n-1 heteroatoms independently selected from N, O, S and P.
5. The composition of claim 1 wherein: R1 and R2 are independently
H or Me; R3 is OH or NHR, wherein R is H or C1-C4 alkyl; and R4 is
optionally substituted, heterocyclic C3-C18 hydrocarbyl comprising
an n-membered ring wherein n=3-18, including 1 to n-1 heteroatoms
independently selected from N, O, S and P.
6. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00198## ##STR00199## ##STR00200##
##STR00201##
7. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00202## ##STR00203## ##STR00204##
##STR00205##
8. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00206## ##STR00207## ##STR00208##
9. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00209## ##STR00210##
10. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00211## ##STR00212## ##STR00213##
##STR00214##
11. The composition of claim 1 wherein: R3 is OH.
12. The composition of claim 2 wherein: R3 is OH.
13. The composition of claim 3 wherein: R3 is OH.
14. The composition of claim 4 wherein: R3 is OH.
15. The composition of claim 5 wherein: R3 is OH.
16. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00215##
17. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00216##
18. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00217## ##STR00218##
19. The composition of claim 1, wherein the FTO inhibitor is a
compound of formula: ##STR00219##
20. A method comprising administering to a person in need thereof a
composition of claim 1 to inhibit FTO, inhibit weight gain, promote
weight loss, reduce serum LDL, cholesterol, LDL-c, or
triglycerides, or treat Obesity or an obesity related disease or
Alzheimer's disease.
Description
INTRODUCTION
Obesity is a severe health problem worldwide and many factors
contribute to this chronic disease, including environmental factors
and genetic factors. Genome-wide association studies to investigate
patients with obesity revealed a gene for FTO (fat mass and
obesity) to strongly associate with obesity. FTO's functional role
in obesity was confirmed in transgenic animal models, such as FTO
knockout mouse, FTO-overexpression mouse and FTO-I367F mutation
mouse. FTO protein is an .alpha.-ketoglutarate and iron (II)
dependent nucleic acid demethylase. Its preferred substrate is
N6-meA in message RNA, which locates near the stop codon and
influences gene translation.
We disclosed in US2014/0148383A1 identification of a known FDA
approved drug--entacapone as an FTO inhibitor using structure-based
virtual screening method in combination with biological activity
measurements, including enzymatic activity, cellular activity and
in high-fat diet induced obesity (DIO) animal model. Entacapone is
a COMT (Catechol-O-methyltransferase) inhibitor used for treating
Parkinson disease.
We synthesized numerous derivative and analogs, however activity
assays revealed many substitutions reduced or obliterated FTO
inhibitory activity, discouraging conventional SAR investigation.
Undeterred we pursued a radical derivitization program introducing
disruptive functional groups. Here we disclose a novel structural
class of FTO inhibitors, composition and methods of use.
EP1978014 discloses processes for preparing entacapone (I) by
demethylation of dimethoxy-entacapone (II), wherein II may be
prepared by reacting a hydroxyl intermediary (III) with
MHB(OCOR).sub.3. This hydroxyl intermediary is coincidentally
structurally related to some of the subject compounds.
SUMMARY OF THE INVENTION
The invention provides compounds, compositions and methods for
inhibiting FTO and treating disease associated with excess FTO
activity, including obesity, obesity-related diseases and
Alzheimer's disease. In one aspect the invention provides an FTO
inhibitor selected from a compound formula I, a stereoisomer
thereof, a hydride thereof, and a pharmaceutically-acceptable salt
thereof, or a pharmaceutical composition formulated and suitable
for administration to a person and comprising in unit dosage the
inhibitor:
##STR00001## wherein: (a) R1 and R2 are independently H or Me; R3
is OH or NHR, wherein R is H or an optionally substituted,
optionally hetero-, optionally cyclic C1-C18 hydrocarbyl; and R4 is
optionally substituted, optionally hetero-, optionally cyclic
C1-C18 hydrocarbyl; (b) R1 and R2 are independently H or Me; R3 is
H, OH or NHR, wherein R is H or C1-C4 alkyl, esp. Me; R4 is CONHR5;
and R5 is optionally substituted, optionally hetero-, optionally
cyclic C1-C18 hydrocarbyl; (c) R1 and R2 are independently H or Me;
R3 is H, OH or NHR, wherein R is H or C1-C4 alkyl, esp. Me; R4 is
COR5; and R5 is optionally substituted, heterocyclic C3-C18
hydrocarbyl comprising an n-membered ring wherein n=3-18 (3, 4, 5,
6, 9 or 10) including 1 to n-1 heteroatoms independently selected
from N, O, S and P; or (d) R1 and R2 are independently H or Me; R3
is H, OH or NHR, wherein R is H or C1-C4 alkyl, esp. Me; and R4 is
optionally substituted, heterocyclic C3-C18 hydrocarbyl comprising
an n-membered ring wherein n=3-18 (3, 4, 5, 6, 9 or 10) including 1
to n-1 heteroatoms independently selected from N, O, S and P;
wherein excluded from the inhibitor, unless present in the
composition, are compounds identified by CAS ID number: 309, CAS
ID: 1364322-41-7; 365, CAS ID:1150310-12-5; 371, CAS ID:
1150310-15-8; and 361, CAS ID:143542-72-7, such as if R3 is
diethylamide and R4 is OH then one or both R1 and R2 is H.
In embodiments of the inhibitor or composition the heterocyclic
C3-C18 hydrocarbyl comprises:
a 3 membered ring that is an optionally substituted: aziridine,
oxirane, oxaziridine;
a 4 membered ring that is an optionally substituted: azetidine,
oxetane, oxazetidine;
a 5 membered ring that is an optionally substituted: pyrrole,
1,2-diazole (pyrazole), 1,3 diazole (imidazole), thiazole,
isothiazole, oxazole, isoxazole, furan, dioxole, thiophene;
a 6 membered ring that is an optionally substituted: pyridine,
diazine, triazine, oxazine, thiazine, dioxine, oxathiine,
dithiine;
a 9 membered ring that is an optionally substituted: indole,
benzothiazole, benzooxazole, benzofuran, benzodioxole,
benzothiophene, benzodithiole; or
a 10 membered ring that is an optionally substituted: quinoline,
quinoxaline, quinazoline, chromene, benzodioxine, thiochromene,
benzodithiine.
In embodiments of the inhibitor or composition the optionally
substituted, optionally hetero-, optionally cyclic C1-C18
hydrocarbyl in each instance is an optionally substituted C1-C9
alkyl, C2-C9 alkenyl, C2-C9 alkynyl, or C5-C14 aryl hydrocarbon,
comprising 1-5 heteroatoms that are N, S, O or P, including 1-5
nitrogen atoms, or a heteroatom substituted with the
hydrocarbon.
In embodiments of the inhibitor or composition:
one or both R1 and R2 is H;
R3 is OH; and/or
R is H or C1-C4 alkyl, esp. Me.
In an aspect the inventors surprising and unexpectedly found that
the compounds disclosed herein wherein R.sub.3 is OH demonstrated a
much longer T.sub.1/2 and a lower Cl.sub.int compared with
entacapone, and that the introduction of hydroxyl imparts better
inhibitory activity of FTO receptor over COMT receptor.
In another aspect the FTO inhibitor is a compound of formula I,
supra, or a stereoisomer thereof, a hydride thereof, or a
pharmaceutically-acceptable salt thereof, wherein:
R.sub.1 and R.sub.2 are each independently H or C.sub.1-4alkyl;
R.sub.3 is OH or NHR, wherein R is hydrogen, --C.sub.1-4alkyl,
cycloalkyl, heterocyclyl, aryl or heteroaryl;
R.sub.4 is hydrogen, --C.sub.1-6alkyl, --C.sub.2-6alkenyl,
--C.sub.2-6alkynyl, cycloalkyl, heterocyclyl, aryl, heteroaryl,
--SO.sub.2R.sub.a, --COR.sub.a, --CO.sub.2R.sub.a,
--CONR.sub.aR.sub.b, NR.sub.aR.sub.b, --NR.sub.aCOR.sub.b,
--NR.sub.aCO.sub.2R.sub.b, or --NR.sub.aSO.sub.2R.sub.b; wherein
said --C.sub.1-6alkyl, --C.sub.2-6alkenyl, --C.sub.2-6alkynyl,
cycloalkyl, heterocyclyl, aryl or heteroaryl are each independently
optionally substituted with at least one substituent R.sub.c;
wherein
R.sub.a and R.sub.b are each independently hydrogen,
C.sub.1-4alkyl, heteroarylC.sub.1-4alkyl-,
heterocyclylC.sub.1-4alkyl-, aryl, heteroaryl, or
C.sub.3-6cycloalkyl; or
R.sub.a and R.sub.b, together with the atom(s) to which they are
attached form a 3- or 4- or 5- or 6-membered ring optionally
comprising an additional heteroatom selected from the group of O,
NH, S and P; and
R.sub.c is hydrogen, halogen, --C.sub.1-6alkyl, --C.sub.2-6alkenyl,
--C.sub.2-6alkynyl, cycloalkyl, heterocyclyl, aryl, heteroaryl,
--CN, --NO.sub.2, oxo, --OH, C.sub.1-6alkyloxy, --SO.sub.2H,
C.sub.1-6alkylSO.sub.2--, --COH, C.sub.1-6alkylCO--, CO.sub.2H,
C.sub.1-6alkylCO.sub.2--, CONH.sub.2 or --NH.sub.2,
provided that said compound is not
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-hydroxyacrylami-
de.
In another embodiment, the FTO inhibitor is a compound of formula
I, supra, or a stereoisomer thereof, a hydride thereof, or a
pharmaceutically-acceptable salt thereof, wherein:
R.sub.1 and R.sub.2 are each independently H or C.sub.1-4alkyl;
R.sub.3 is OH;
R.sub.4 is heteroaryl, --COR.sub.a, or --CONR.sub.aR.sub.b; wherein
said heteroaryl is optionally substituted with at least one
substituent R.sub.c;
wherein
R.sub.a and R.sub.b are each independently hydrogen,
C.sub.1-4alkyl, heteroarylC.sub.1-4alkyl-,
heterocyclylC.sub.1-4alkyl-, aryl, heteroaryl, or
C.sub.3-6cycloalkyl; or
R.sub.a and R.sub.b, together with the nitrogen atom to which they
are attached form a 3- or 4- or 5- or 6-membered monocyclic ring
optionally comprising an additional heteroatom selected from the
group of O, NH, S and P; and
R.sub.c is hydrogen, halogen, --C.sub.1-6alkyl, --C.sub.2-6alkenyl,
--C.sub.2-6alkynyl, cycloalkyl, heterocyclyl, aryl, heteroaryl,
--CN, --NO.sub.2, oxo, --OH, C.sub.1-6alkyloxy, --SO.sub.2H,
C.sub.1-6alkylSO.sub.2--, --COH, C.sub.1-6alkylCO--, CO.sub.2H,
C.sub.1-6alkylCO.sub.2--, CONH.sub.2 or --NH.sub.2,
provided that said compound is not
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-hydroxyacrylami-
de.
In particular embodiments, R.sub.1 and R.sub.2 are each H; one of
R.sub.1 and R.sub.2 is H, the other is C.sub.1-4alkyl, preferably
methyl; or R.sub.1 and R.sub.2 are each C.sub.1-4alkyl, preferably
methyl.
In particular embodiments, R.sub.4 is --COR.sub.a, wherein R.sub.a
is heteroaryl, wherein preferably R.sub.a is a 5-membered
heteroaryl comprising one nitrogen atom and one sulfur atom,
preferably, R.sub.a is thiazolyl, e.g., thiazole-4-yl.
In embodiments R.sub.4 is --CONR.sub.aR.sub.b, R.sub.a and R.sub.b
are each independently hydrogen, C.sub.1-4alkyl,
heteroarylC.sub.1-4alkyl-, heterocyclylC.sub.1-4alkyl-, heteroaryl,
or C.sub.3-6cycloalkyl, wherein preferably, R.sub.a and R.sub.b are
both C.sub.1-4alkyl; more preferably, R.sub.a and R.sub.b are both
ethyl. Alternatively, one of R.sub.a and R.sub.b is hydrogen, the
other is C.sub.1-4alkyl, heteroarylC.sub.1-4alkyl-,
heterocyclylC.sub.1-4alkyl-, heteroaryl or C.sub.3-6cycloalkyl;
preferably, one of R.sub.a and R.sub.b is hydrogen, the other is
C.sub.1-4alkyl, pyrimidinylC.sub.1-4alkyl- (e.g.,
pyrimidin-4-ylmethyl), 5- to 10-membered heteroaryl (e.g.,
pyridinyl, pyrizinyl, pyrimidinyl, thiazolyl, benzo[d]thiazolyl,
thiadiazolyl), or C.sub.3-6cycloalkyl (e.g., cyclopropyl,
cyclobutyl, cyclopentyl or cyclohexyl). Alternatively, R.sub.a and
R.sub.b, together with the nitrogen atom to which they are attached
form a 3- or 4- or 5- or 6-membered monocyclic ring optionally
comprising an additional heteroatom selected from the group of O,
NH, and S; R.sub.a and R.sub.b, together with the nitrogen atom to
which they are attached form a 3- or 4- or 5- or 6-membered
monocyclic ring optionally comprising one additional oxygen atom.
Preferably, R.sub.a and R.sub.b, together with the nitrogen atom to
which they are attached form a 4- or 6-membered monocyclic ring
optionally comprising one additional oxygen atom. More preferably,
R.sub.a and R.sub.b, together with the nitrogen atom to which they
are attached form a 4-membered monocyclic ring, or a 6-membered
monocyclic ring or a 6-membered monocyclic ring comprising one
additional oxygen atom. Most preferably, R.sub.a and R.sub.b,
together with the nitrogen atom to which they are attached form a
piperidinyl, azetidinyl or 1,3-oxazinanyl.
In embodiments, R.sub.4 is heteroaryl optionally substituted with
at least one substituent R.sub.c, wherein R.sub.c is as defined
above; wherein preferably, R.sub.4 is a 5- or 6-membered monocyclic
heteroaryl comprising one or two or three or four heteroatoms
selected from NH, O, S and P (preferably 5- or 6-membered
monocyclic heteroaryl comprising one or two or three or four
heteroatoms selected from NH, O and S); or a 9 or 10-membered
bicylic heteroaryl comprising one or two or three or four
heteroatoms selected from NH, O, S and P (preferably, a 9 or
10-membered bicylic heteroaryl comprising one or two or three or
four heteroatoms selected from NH, O and S). More preferably,
R.sub.4 is pyridinyl, pyrizinyl optionally substituted by carboxyl,
pyrimidinyl, thiazolyl, benzo[d]thiazolyl, or 1,2,4-thiadiazolyl.
Most preferably, R.sub.4 is pyridin-2-yl, pyrizin-2-yl optionally
substituted by carboxyl, pyrimidin-4-yl, thiazol-2-yl,
benzo[d]thiazol-2-yl, or 1,2,4-thiadiazol-5-yl.
In embodiments the inhibitor is of the following Tables. We
measured compound inhibition activity in a demethylation reaction
catalyzed by FTO (US2014/0148383A1). The reaction system was
incubated at 37.degree. C. for 2 h and stopped by heating at
95.degree. C. for 5 min ssDNA was digested by nuclease P1 and
alkaline phosphatase. The concentrations of N6-mA and A were
analyzed by HPLC-MS/MS. When concentration of substrate and enzyme
are 0.5 .mu.M and 0.1 .mu.M, respectively, the measured IC50 value
of entacapone against FTO is .about.3 .mu.M.
TABLE-US-00001 TABLE 1 Subsection (a) inhibitors, wherein R3 is OH,
demonstrating IC50 value <10 .mu.M in demethylation reaction
catalyzed by FTO; experimental details below. ##STR00002## 347
##STR00003## 351 ##STR00004## 352 ##STR00005## 523 ##STR00006## 524
##STR00007## 525 ##STR00008## 503 ##STR00009## 359 ##STR00010## 374
##STR00011## 668 ##STR00012## 661 ##STR00013## 658 ##STR00014## 673
##STR00015## 674 ##STR00016## 722 ##STR00017## 697 ##STR00018## 691
##STR00019## 692 ##STR00020## 701 ##STR00021## 715 ##STR00022##
711
TABLE-US-00002 TABLE 2 Subsection (a) inhibitors, wherein R3 is
NHR, demonstrating IC50 value <10 .mu.M in demethylation
reaction catalyzed by FTO; experimental details below. ##STR00023##
347N ##STR00024## 351N ##STR00025## 352N ##STR00026## 523N
##STR00027## 524N ##STR00028## 525N ##STR00029## 503N ##STR00030##
359N ##STR00031## 374N ##STR00032## 668N ##STR00033## 661N
##STR00034## 658N ##STR00035## 673N ##STR00036## 674N ##STR00037##
722N ##STR00038## 697N ##STR00039## 691N ##STR00040## 692N
##STR00041## 701N ##STR00042## 715N ##STR00043## 711N ##STR00044##
711NM ##STR00045## 711NE ##STR00046## 711NB
TABLE-US-00003 TABLE 3 Subsection (b) inhibitors, wherein R4 is
CONHR5, demonstrating IC50 value <10 .mu.M in demethylation
reaction catalyzed by FTO; experimental details below. ##STR00047##
664 ##STR00048## 684 ##STR00049## 688 ##STR00050## 713 ##STR00051##
709 ##STR00052## 712 ##STR00053## 693 ##STR00054## 801 ##STR00055##
802 ##STR00056## 331 ##STR00057## 803 ##STR00058## 804 ##STR00059##
333 ##STR00060## 805 ##STR00061## 318 ##STR00062## 806 ##STR00063##
366 ##STR00064## 807 ##STR00065## 365 CAS ID: 1150310- 12-5
##STR00066## 380 ##STR00067## 374 ##STR00068## 668 ##STR00069## 673
##STR00070## 674 ##STR00071## 722 ##STR00072## 374N ##STR00073##
668N ##STR00074## 673N ##STR00075## 674N ##STR00076## 800N
##STR00077## 691N ##STR00078## 692N
TABLE-US-00004 TABLE 4 Subsection (c) inhibitors, wherein R4 is
COR5, demonstrating IC50 value <10 .mu.M in demethylation
reaction catalyzed by FTO; experimental details below. ##STR00079##
808 ##STR00080## 687 ##STR00081## 809 ##STR00082## 317 ##STR00083##
810 ##STR00084## 371 CAS ID: 1150310- 15-3 ##STR00085## 378
##STR00086## 660 ##STR00087## 382 ##STR00088## 702 ##STR00089## 811
##STR00090## 812 ##STR00091## 813 ##STR00092## 814 ##STR00093## 815
##STR00094## 816 ##STR00095## 817 ##STR00096## 818 ##STR00097## 819
##STR00098## 820 ##STR00099## 821 ##STR00100## 822 ##STR00101## 823
##STR00102## 824 ##STR00103## 698 ##STR00104## 675 ##STR00105## 825
##STR00106## 826 ##STR00107## 827 ##STR00108## 394 ##STR00109## 661
##STR00110## 658 ##STR00111## 701 ##STR00112## 711 ##STR00113## 715
##STR00114## 711N ##STR00115## 661N ##STR00116## 658N ##STR00117##
701N ##STR00118## 715N
TABLE-US-00005 TABLE 5 Subsection (d) inhibitors, wherein R4 is
heterocyclic, demonstrating IC50 value <10 .mu.M in
demethylation reaction catalyzed by FTO; experimental details
below. ##STR00119## 390 ##STR00120## 656 ##STR00121## 666
##STR00122## 829 ##STR00123## 315 ##STR00124## 400 ##STR00125## 319
##STR00126## 389 ##STR00127## 502 ##STR00128## 505 ##STR00129## 395
##STR00130## 396 ##STR00131## 522 ##STR00132## 655 ##STR00133## 830
##STR00134## 831 ##STR00135## 518 ##STR00136## 520 ##STR00137## 361
CAS ID: 143542- 72-7 ##STR00138## 517 ##STR00139## 519 ##STR00140##
351 ##STR00141## 352 ##STR00142## 523 ##STR00143## 524 ##STR00144##
525 ##STR00145## 503 ##STR00146## 359 ##STR00147## 697 ##STR00148##
351N ##STR00149## 352N ##STR00150## 523N ##STR00151## 524N
##STR00152## 525N ##STR00153## 503N ##STR00154## 359N ##STR00155##
697N
In another aspect the invention provides a pharmaceutical
composition suitable for administration to a human and comprising a
subject or disclosed inhibitor.
The compositions may comprise a pharmaceutically-acceptable
excipient, be in effective, unit dosage form, and/or comprise
another, different therapeutic agents for the targeted disease or
condition. In embodiments, the compositions may further comprise or
be copackaged or coformulated with a second, different medicament
for inhibiting weight gain, promoting weight loss, reducing serum
LDL, cholesterol, LDL-c, or triglycerides, or treating obesity or
an obesity related disease (esp. obesity-related diabetes,
hyperglycemia, diabetic nephropathy, hyperlipemia, coronary heart
disease, atherosclerosis, hypertension, cardiovascular or
cerebrovascular disease) or Alzheimer's disease.
In embodiments:
the medicament is an AD drug that is an acetylcholinesterase
inhibitor (esp. tacrine, rivastigmine, galantamine and donepezil)
or an NMDA receptor antagonist (esp. memantine);
the medicament is a medicament for inhibiting weight gain that is a
food intake inhibitor or a food absorption inhibitor;
the medicament is a medicament for inhibiting weight gain that is
Orlistat, Sibutramine, Lorcaserin, Rimonabant, Metformin,
Exenatide, Pramlintide, phentermine/topiramate, or a
pharmaceutically-acceptable salt thereof;
the medicament is a medicament for reducing serum LDL, cholesterol,
LDL-c, or triglycerides, that is atorvastatin (Lipitor),
fluvastatin (Lescol), lovastatin (Altoprev, Mevacor), pravastatin
(Pravachol), rosuvastatin (Crestor), simvastatin (Zocor),
cholestyramine (Prevalite, Questran), colesevelam (Welchol),
colestipol (Colestid), ezetimibe (Zetia), ezetimibe-simvastatin
(Vytorin), fenofibrate (Lofibra, TriCor), gemfibrozil (Lopid),
Niacin (Niaspan), Omega-3 fatty acid (Lovaza), or a
pharmaceutically-acceptable salt thereof.
the medicament is a diabetes or hypoglycemia medicament, such as
glibenclamide, glipizide, gliquidone, gliclazide, glimepiride,
glibornuride, repaglinide, nateglinide, metformin, acarbose,
voglibose, rosiglitazone, pioglitazone, exenatide, liraglutide,
sitagliptin, saxagliptin, vildagliptin, canagliflozin,
dapaglifozin, or a pharmaceutically-acceptable salt thereof.
In another aspect the invention provides methods of treating a
person in need thereof with an effective amount of the subject
inhibitor or pharmaceutical composition, and optionally, detecting
a resultant improvement in the person's health or condition. The
methods may also optionally include the antecedent step of
determining that the person, particularly diagnosing and applicable
disease or condition (herein). In embodiments the invention
provides methods and uses of a subject inhibitor or composition in
a person in need thereof, to inhibit FTO, inhibit weight gain,
promote weight loss, reduce serum LDL, cholesterol, LDL-c, or
triglycerides, or treat obesity or an obesity related disease or
Alzheimer's Disease.
The invention encompasses all combination of the particular
embodiments recited herein, as if each had been separately,
laboriously recited. For example, subsection (a) encompasses
combinations wherein: R1 and R2 are H; R3 is NH.sub.2; and R4 is a
6 membered ring that is pyridine, and subsection (d) encompasses
combinations wherein R1 and R2 are Me; R3 is OH; and R4 is 1,3
diazole.
Description of Particular Embodiments of the Invention
The following descriptions of particular embodiments and examples
are provided by way of illustration and not by way of limitation.
Those skilled in the art will readily recognize a variety of
noncritical parameters that could be changed or modified to yield
essentially similar results.
Unless contraindicated or noted otherwise, in these descriptions
and throughout this specification, the terms "a" and "an" mean one
or more, the term "or" means and/or and polynucleotide sequences
are understood to encompass opposite strands as well as alternative
backbones described herein. Furthermore, genuses are recited as
shorthand for a recitation of all members of the genus; for
example, the recitation of (C1-C3) alkyl is shorthand for a
recitation of all C1-C3 alkyls: methyl, ethyl and propyl, including
isomers thereof.
A hydrocarbyl group is a substituted or unsubstituted,
straight-chain, branched or cyclic alkyl, alkenyl, alkynyl, acyl,
aryl, arylalkyl, arylalkenyl, arylalkynyl, alkylaryl, alkenylaryl
or alkynylaryl group which comprises 1-15 carbon atoms and
optionally includes one or more heteroatoms in its carbon
skeleton.
The term "heteroatom" as used herein generally means any atom other
than carbon or hydrogen. Preferred heteroatoms include oxygen (O),
phosphorus (P), sulfur (S), nitrogen (N), and halogens, and
preferred heteroatom functional groups are haloformyl, hydroxyl,
aldehyde, amine, azo, carboxyl, cyanyl, thocyanyl, carbonyl, halo,
hydroperoxyl, imine, aldimine, isocyanide, iscyante, nitrate,
nitrile, nitrite, nitro, nitroso, phosphate, phosphono, sulfide,
sulfonyl, sulfo, and sulfhydryl.
The term "alkyl," by itself or as part of another substituent,
means, unless otherwise stated, a straight or branched chain, or
cyclic hydrocarbon radical, or combination thereof, which is fully
saturated, having the number of carbon atoms designated (i.e. C1-C8
means one to eight carbons). Examples of alkyl groups include
methyl, ethyl, n-propyl, isopropyl, n-butyl, t-butyl, isobutyl,
sec-butyl, cyclohexyl, (cyclohexyl)methyl, cyclopropylmethyl,
homologs and isomers of, for example, n-pentyl, n-hexyl, n-heptyl,
n-octyl and the like.
The term "alkenyl", by itself or as part of another substituent,
means a straight or branched chain, or cyclic hydrocarbon radical,
or combination thereof, which may be mono- or polyunsaturated,
having the number of carbon atoms designated (i.e. C2-C8 means two
to eight carbons) and one or more double bonds. Examples of alkenyl
groups include vinyl, 2-propenyl, crotyl, 2-isopentenyl,
2-(butadienyl), 2,4-pentadienyl, 3-(1,4-pentadienyl) and higher
homologs and isomers thereof.
The term "alkynyl", by itself or as part of another substituent,
means a straight or branched chain hydrocarbon radical, or
combination thereof, which may be mono- or polyunsaturated, having
the number of carbon atoms designated (i.e. C2-C8 means two to
eight carbons) and one or more triple bonds. Examples of alkynyl
groups include ethynyl, 1- and 3-propynyl, 3-butynyl and higher
homologs and isomers thereof.
The term "alkylene" by itself or as part of another substituent
means a divalent radical derived from alkyl, as exemplified by
--CH.sub.2--CH.sub.2--CH.sub.2--CH.sub.2--. Typically, an alkyl (or
alkylene) group will have from 1 to 24 carbon atoms, with those
groups having 10 or fewer carbon atoms being preferred in the
invention. A "lower alkyl" or "lower alkylene" is a shorter chain
alkyl or alkylene group, generally having eight or fewer carbon
atoms.
The terms "alkoxy," "alkylamino" and "alkylthio" (or thioalkoxy)
are used in their conventional sense, and refer to those alkyl
groups attached to the remainder of the molecule via an oxygen
atom, an amino group, or a sulfur atom, respectively.
The term "heteroalkyl," by itself or in combination with another
term, means, unless otherwise stated, a stable straight or branched
chain, or cyclic hydrocarbon radical, or combinations thereof,
consisting of the stated number of carbon atoms and from one to
three heteroatoms selected from the group consisting of O, N, P, Si
and S, wherein the nitrogen, sulfur, and phosphorous atoms may
optionally be oxidized and the nitrogen heteroatom may optionally
be quaternized. The heteroatom(s) O, N, P and S may be placed at
any interior position of the heteroalkyl group. The heteroatom Si
may be placed at any position of the heteroalkyl group, including
the position at which the alkyl group is attached to the remainder
of the molecule. Examples include
--CH.sub.2--CH.sub.2--O--CH.sub.3,
--CH.sub.2--CH.sub.2--NH--CH.sub.3,
--CH.sub.2--CH.sub.2--N(CH.sub.3)--CH.sub.3,
--CH.sub.2--S--CH.sub.2--CH.sub.3, --CH.sub.2--CH.sub.2,
--S(O)--CH.sub.3, --CH.sub.2--CH.sub.2--S(O).sub.2--CH.sub.3,
--CH.dbd.CH--O--CH.sub.3, --Si(CH.sub.3).sub.3,
--CH.sub.2--CH.dbd.N--OCH.sub.3, and --CH.dbd.CH--N(CH3)-CH.sub.3.
Up to two heteroatoms may be consecutive, such as, for example,
--CH.sub.2--NH--OCH.sub.3 and
--CH.sub.2--O--Si(CH.sub.3).sub.3.
Similarly, the term "heteroalkylene," by itself or as part of
another substituent means a divalent radical derived from
heteroalkyl, as exemplified by
--CH.sub.2--CH.sub.2--S--CH.sub.2--CH.sub.2-- and
--CH.sub.2--S--CH.sub.2--CH.sub.2--NH--CH.sub.2--. For
heteroalkylene groups, heteroatoms can also occupy either or both
of the chain termini (e.g., alkyleneoxy, alkylenedioxy,
alkyleneamino, alkylenediamino, and the like). Still further, for
alkylene and heteroalkylene linking groups, no orientation of the
linking group is implied.
The terms "cycloalkyl" and "heterocycloalkyl", by themselves or in
combination with other terms, represent, unless otherwise stated,
cyclic versions of "alkyl" and "heteroalkyl", respectively.
Accordingly, a cycloalkyl group has the number of carbon atoms
designated (i.e., C3-C8 means three to eight carbons) and may also
have one or two double bonds. A heterocycloalkyl group consists of
the number of carbon atoms designated and from one to three
heteroatoms selected from the group consisting of O, N, Si and S,
and wherein the nitrogen and sulfur atoms may optionally be
oxidized and the nitrogen heteroatom may optionally be quaternized.
Additionally, for heterocycloalkyl, a heteroatom can occupy the
position at which the heterocycle is attached to the remainder of
the molecule. Examples of cycloalkyl include cyclopentyl,
cyclohexyl, 1-cyclohexenyl, 3-cyclohexenyl, cycloheptyl, and the
like. Examples of heterocycloalkyl include
1-(1,2,5,6-tetrahydropyrid-yl), 1-piperidinyl, 2-piperidinyl,
3-piperidinyl, 4-morpholinyl, 3-morpholinyl, tetrahydrofuran-2-yl,
tetrahydrofuran-3-yl, tetrahydrothien-2-yl, tetrahydrothien-3-yl,
1-piperazinyl, 2-piperazinyl, and the like.
The terms "halo" and "halogen," by themselves or as part of another
substituent, mean, unless otherwise stated, a fluorine, chlorine,
bromine, or iodine atom. Additionally, terms such as "haloalkyl,"
are meant to include alkyl substituted with halogen atoms, which
can be the same or different, in a number ranging from one to
(2m'+1), where m' is the total number of carbon atoms in the alkyl
group. For example, the term "halo(C1-C4)alkyl" is mean to include
trifluoromethyl, 2,2,2-trifluoroethyl, 4-chlorobutyl,
3-bromopropyl, and the like. Thus, the term "haloalkyl" includes
monohaloalkyl (alkyl substituted with one halogen atom) and
polyhaloalkyl (alkyl substituted with halogen atoms in a number
ranging from two to (2m+1) halogen atoms, where m' is the total
number of carbon atoms in the alkyl group). The term "perhaloalkyl"
means, unless otherwise stated, alkyl substituted with (2m'+1)
halogen atoms, where m' is the total number of carbon atoms in the
alkyl group. For example the term "perhalo(C1-C4)alkyl" is meant to
include trifluoromethyl, pentachloroethyl,
1,1,1-trifluoro-2-bromo-2-chloroethyl and the like.
The term "acyl" refers to those groups derived from an organic acid
by removal of the hydroxy portion of the acid. Accordingly, acyl is
meant to include, for example, acetyl, propionyl, butyryl,
decanoyl, pivaloyl, benzoyl and the like.
The term "aryl" means, unless otherwise stated, a polyunsaturated,
typically aromatic, hydrocarbon substituent which can be a single
ring or multiple rings (up to three rings) which are fused together
or linked covalently. Non-limiting examples of aryl groups include
phenyl, 1-naphthyl, 2-naphthyl, 4-biphenyl and
1,2,3,4-tetrahydronaphthalene.
The term heteroaryl," refers to aryl groups (or rings) that contain
from zero to four heteroatoms selected from N, O, and S, wherein
the nitrogen and sulfur atoms are optionally oxidized and the
nitrogen heteroatom are optionally quaternized. A heteroaryl group
can be attached to the remainder of the molecule through a
heteroatom. Non-limiting examples of heteroaryl groups include
1-pyrrolyl, 2-pyrrolyl, 3-pyrrolyl, 3-pyrazolyl, 2-imidazolyl,
4-imidazolyl, pyrazinyl, 2-oxazolyl, 4-oxazolyl,
2-phenyl-4-oxazolyl, 5-oxazolyl, 3-isoxazolyl, 4-isoxazolyl,
5-isoxazolyl, 2-thiazolyl, 4-thiazolyl, 5-thiazolyl, 2-furyl,
3-furyl, 2-thienyl, 3-thienyl, 2-pyridyl, 3-pyridyl, 4-pyridyl,
2-pyrimidyl, 4-pyrimidyl, 5-benzothiazolyl, purinyl,
2-benzimidazolyl, 5-indolyl, 1-isoquinolyl, 5-isoquinolyl,
2-quinoxalinyl, 5-quinoxalinyl, 3-quinolyl and 6-quinolyl.
For brevity, the term "aryl" when used in combination with other
terms (e.g., aryloxy, arylthioxy, arylalkyl) includes both aryl and
heteroaryl rings as defined above. Thus, the term "arylalkyl" is
meant to include those radicals in which an aryl group is attached
to an alkyl group (e.g., benzyl, phenethyl, pyridylmethyl and the
like) including those alkyl groups in which a carbon atom (e.g., a
methylene group) has been replaced by, for example, an oxygen atom
(e.g., phenoxymethyl, 2-pyridyloxymethyl, 3-(1-naphthyloxy)propyl,
and the like).
Each of the above terms (e.g., "alkyl," "heteroalkyl," "aryl" and
"heteroaryl") is meant to include both substituted and
unsubstituted forms of the indicated radical. Preferred
substituents for each type of radical are provided below.
Substituents for the alkyl and heteroalkyl radicals (as well as
those groups referred to as alkylene, alkenyl, heteroalkylene,
heteroalkenyl, alkynyl, cycloalkyl, heterocycloalkyl, cycloalkenyl
and heterocycloalkenyl) can be a variety of groups selected from:
--OR', .dbd.O, .dbd.NR', .dbd.N--OR', --NR'R'', --SR', halogen,
--SiR'R''R''', --OC(O)R', --C(O)R', --CONR'R'', --OC(O)NR'R'',
--NR''C(O)R', --NR'--C(O)NR''R''', --NR'--SO.sub.2NR''',
--NR''CO.sub.2R', --NH--C(NH.sub.2).dbd.NH,
--NR'C(NH.sub.2).dbd.NH, --NH--C(NH.sub.2).dbd.NR', --S(O)R',
--SO.sub.2NR'R'', --NR''SO.sub.2R, --CN and --NO.sub.2, in a number
ranging from zero to three, with those groups having zero, one or
two substituents being particularly preferred. R', R'' and R'' each
independently refer to hydrogen, unsubstituted (C1-C8)alkyl and
heteroalkyl, unsubstituted aryl, aryl substituted with one to three
halogens, unsubstituted alkyl, alkoxy or thioalkoxy groups, or
aryl-(C1-C4)alkyl groups. When R' and R'' are attached to the same
nitrogen atom, they can be combined with the nitrogen atom to form
a 5-, 6- or 7-membered ring. For example, --NR'R'' is meant to
include 1-pyrrolidinyl and 4-morpholinyl. Typically, an alkyl or
heteroalkyl group will have from zero to three substituents, with
those groups having two or fewer substituents being preferred in
the invention. More preferably, an alkyl or heteroalkyl radical
will be unsubstituted or monosubstituted. Most preferably, an alkyl
or heteroalkyl radical will be unsubstituted. From the above
discussion of substituents, one of skill in the art will understand
that the term "alkyl" is meant to include groups such as
trihaloalkyl (e.g., --CF.sub.3 and --CH.sub.2CF.sub.3).
Preferred substituents for the alkyl and heteroalkyl radicals are
selected from: --OR, .dbd.O, --NR'R'', --SR', halogen,
--SiR'R''R''', --OC(O)R', --C(O)R', --CO.sub.2R', --CONR'R'',
--OC(O)NR'R'', --NR''C(O)R', --NR''CO.sub.2R',
--NR'--SO.sub.2NR''R''', --S(O)R', --SO2R', --SO.sub.2NR'R'',
--NR''SO.sub.2R, --CN and --NO.sub.2, where R' and R'' are as
defined above. Further preferred substituents are selected from:
--OR', .dbd.O, --NR'R'', halogen, --OC(O)R', --CO.sub.2R',
--CONR'R'', --OC(O)NR'R'', --NR''C(O)R', --NR''CO.sub.2R',
--NR'--SO.sub.2NR''R''', --SO.sub.2R', --SO.sub.2NR'R'',
--NR''SO.sub.2R, --CN and --NO.sub.2.
Similarly, substituents for the aryl and heteroaryl groups are
varied and selected from: halogen, --OR', --OC(O)R', --NR'R'',
--SR', --R', --CN, --NO.sub.2, --CO.sub.2R', --CONR'R'', --C(O)R',
--OC(O)NR'R'', --NR''C(O)R', --NR''CO2R', --NR'--C(O)NR''R''',
--NR'--SO.sub.2NR''R''', --NH--C(NH2)=NH, --NR'C(NH.sub.2).dbd.NH,
--NH--C(NH.sub.2).dbd.NR', --S(O)R', --SO.sub.2R, --SO.sub.2NR'R'',
--NR''SO.sub.2R, --N.sub.3, --CH(Ph).sub.2, perfluoro(C1-C4)alkoxy
and perfluoro(C1-C4)alkyl, in a number ranging from zero to the
total number of open valences on the aromatic ring system; and
where R, R'' and R''' are independently selected from hydrogen,
(C1-C8)alkyl and heteroalkyl, unsubstituted aryl and heteroaryl,
(unsubstituted aryl)-(C1-C4)alkyl and (unsubstituted
aryl)oxy-(C1-C4)alkyl. When the aryl group is
1,2,3,4-tetrahydronaphthalene, it may be substituted with a
substituted or unsubstituted (C3-C7)spirocycloalkyl group. The
(C3-C7)spirocycloalkyl group may be substituted in the same manner
as defined herein for "cycloalkyl". Typically, an aryl or
heteroaryl group will have from zero to three substituents, with
those groups having two or fewer substituents being preferred in
the invention. In one embodiment of the invention, an aryl or
heteroaryl group will be unsubstituted or monosubstituted. In
another embodiment, an aryl or heteroaryl group will be
unsubstituted.
Preferred substituents for aryl and heteroaryl groups are selected
from: halogen, --OR, --OC(O)R', --NR'R'', --SR', --R, --CN,
--NO.sub.2, --CO.sub.2R', --CONR'R'', --C(O)R', --OC(O)NR'R'',
--NR''C(O)R', --S(O)R', --SO.sub.2R, --SO.sub.2NR'R'',
--NR''SO.sub.2R, --N.sub.3, --CH(Ph).sub.2, perfluoro(C1-C4)alkoxy
and perfluoro(C1-C4)alkyl, where R' and R'' are as defined above.
Further preferred substituents are selected from: halogen, --OR',
--OC(O)R', --NR'R'', --R', --CN, --NO.sub.2, --CO.sub.2R',
--CONR'R'', --NR''C(O)R', --SO.sub.2R, --SO.sub.2NR'R'',
--NR''SO.sub.2R, perfluoro(C1-C4)alkoxy and
perfluoro(C1-C4)alkyl.
The substituent --CO.sub.2H, as used herein, includes bioisosteric
replacements therefor; see, e.g., The Practice of Medicinal
Chemistry; Wermuth, C. G., Ed.; Academic Press: New York, 1996; p.
203.
Two of the substituents on adjacent atoms of the aryl or heteroaryl
ring may optionally be replaced with a substituent of the formula
--T--C(O)--(CH.sub.2)q--U--, wherein T and U are independently
--NH--, --O--, --CH.sub.2-- or a single bond, and q is an integer
of from 0 to 2. Alternatively, two of the substituents on adjacent
atoms of the aryl or heteroaryl ring may optionally be replaced
with a substituent of the formula --A--(CH2)r--B--, wherein A and B
are independently --CH.sub.2--, --O--, --NH--, --S--, --S(O)--,
--S(O).sub.2--, --S(O).sub.2NR'-- or a single bond, and r is an
integer of from 1 to 3. One of the single bonds of the new ring so
formed may optionally be replaced with a double bond.
Alternatively, two of the substituents on adjacent atoms of the
aryl or heteroaryl ring may optionally be replaced with a
substituent of the formula --(CH.sub.2)s-X--(CH.sub.2)t-, where s
and t are independently integers of from 0 to 3, and X is --O--,
--NR'--, --S--, --S(O)--, --S(O).sub.2--, or --S(O).sub.2NR'--. The
substituent R in --NR'-- and --S(O).sub.2NR'-- is selected from
hydrogen or unsubstituted (C1-C6)alkyl.
Preferred substituents are disclosed herein and exemplified in the
tables, structures, examples, and claims, and may be applied across
different compounds of the invention, i.e. substituents of any
given compound may be combinatorially used with other
compounds.
In particular embodiments applicable substituents are independently
substituted or unsubstituted heteroatom, substituted or
unsubstituted, optionally heteroatom C1-C6 alkyl, substituted or
unsubstituted, optionally heteroatom C2-C6 alkenyl, substituted or
unsubstituted, optionally heteroatom C2-C6 alkynyl, or substituted
or unsubstituted, optionally heteroatom C6-C14 aryl, wherein each
heteroatom is independently oxygen, phosphorus, sulfur or
nitrogen.
In more particular embodiments, applicable substituents are
independently aldehyde, aldimine, alkanoyloxy, alkoxy,
alkoxycarbonyl, alkyloxy, alkyl, amine, azo, halogens, carbamoyl,
carbonyl, carboxamido, carboxyl, cyanyl, ester, halo, haloformyl,
hydroperoxyl, hydroxyl, imine, isocyanide, iscyante,
N-tert-butoxycarbonyl, nitrate, nitrile, nitrite, nitro, nitroso,
phosphate, phosphono, sulfide, sulfonyl, sulfo, sulfhydryl, thiol,
thiocyanyl, trifluoromethyl or trifluromethyl ether (OCF3).
The term "pharmaceutically acceptable salts" is meant to include
salts of the active compounds which are prepared with relatively
nontoxic acids or bases, depending on the particular substituents
found on the compounds described herein, and suitable for
pharmaceutical use. When compounds of the invention contain
relatively acidic functionalities, base addition salts can be
obtained by contacting the neutral form of such compounds with a
sufficient amount of the desired base, either neat or in a suitable
inert solvent. Examples of pharmaceutically acceptable base
addition salts include sodium, potassium, calcium, ammonium,
organic amino, or magnesium salt, or a similar salt. When compounds
of the invention contain relatively basic functionalities, acid
addition salts can be obtained by contacting the neutral form of
such compounds with a sufficient amount of the desired acid, either
neat or in a suitable inert solvent. Examples of pharmaceutically
acceptable acid addition salts include those derived from inorganic
acids like hydrochloric, hydrobromic, nitric, carbonic,
monohydrogencarbonic, phosphoric, monohydrogenphosphoric,
dihydrogenphosphoric, sulfuric, monohydrogensulfuric, hydriodic, or
phosphorous acids and the like, as well as the salts derived from
relatively nontoxic organic acids like acetic, propionic,
isobutyric, oxalic, maleic, malonic, benzoic, succinic, suberic,
fumaric, mandelic, phthalic, benzenesulfonic, p-tolylsulfonic,
citric, tartaric, methanesulfonic, and the like. Also included are
salts of amino acids such as arginate and the like, and salts of
organic acids like glucuronic or galactunoric acids and the like.
Certain specific compounds of the invention contain both basic and
acidic functionalities that allow the compounds to be converted
into either base or acid addition salts.
The neutral forms of the compounds may be regenerated by contacting
the salt with a base or acid and isolating the parent compound in
the conventional manner. The parent form of the compound differs
from the various salt forms in certain physical properties, such as
solubility in polar solvents, but otherwise the salts are
equivalent to the parent form of the compound for the purposes of
the invention.
In addition to salt forms, the invention provides compounds which
are in a prodrug form. Prodrugs of the compounds described herein
are those compounds that undergo chemical changes under
physiological conditions to provide the compounds of the invention.
Additionally, prodrugs can be converted to the compounds of the
invention by chemical or biochemical methods in an ex vivo
environment. For example, prodrugs can be slowly converted to the
compounds of the invention when placed in a transdermal patch
reservoir with a suitable enzyme or chemical reagent. Prodrugs are
often useful because, in some situations, they may be easier to
administer than the parent drug. They may, for instance, be more
bioavailable by oral administration than the parent drug. The
prodrug may also have improved solubility in pharmacological
compositions over the parent drug. A wide variety of prodrug
derivatives are known in the art, such as those that rely on
hydrolytic cleavage or oxidative activation of the prodrug. An
example, without limitation, of a prodrug would be a compound of
the invention which is administered as an ester (the "prodrug"),
but then is metabolically hydrolyzed to the carboxylic acid, the
active entity. Additional examples include peptidyl derivatives of
a compound of the invention.
Certain compounds of the invention can exist in unsolvated forms as
well as solvated forms, including hydrated forms. In general, the
solvated forms are equivalent to unsolvated forms and are intended
to be encompassed within the scope of the invention. Certain
compounds of the invention may exist in multiple crystalline or
amorphous forms. In general, all physical forms are equivalent for
the uses contemplated by the invention and are intended to be
within the scope of the invention.
Some of the subject compounds possess asymmetric carbon atoms
(optical centers) or double bonds; the racemates, diastereomers,
geometric isomers and specifically designated or depicted chirality
is preferred and in many cases critical for optimal activity;
however all such isomers are all intended to be encompassed within
the scope of the invention.
The compounds of the invention may also contain unnatural
proportions of atomic isotopes at one or more of the atoms that
constitute such compounds. For example, the compounds may be
radiolabeled with radioactive isotopes, such as for example tritium
(.sup.3H), iodine-125 (.sup.125I) or carbon-14 (.sup.14C). All
isotopic variations of the compounds of the invention, whether
radioactive or not, are intended to be encompassed within the scope
of the invention.
The term "therapeutically effective amount" refers to the amount of
the subject compound that will elicit, to some significant extent,
the biological or medical response of a tissue, system, animal or
human that is being sought by the researcher, veterinarian, medical
doctor or other clinician, such as when administered, is sufficient
to prevent development of, or alleviate to some extent, one or more
of the symptoms of the condition or disorder being treated. The
therapeutically effective amount will vary depending on the
compound, the disease and its severity and the age, weight, etc.,
of the mammal to be treated.
The invention also provides pharmaceutical compositions comprising
the subject compounds and a pharmaceutically acceptable excipient,
particularly such compositions comprising a unit dosage of the
subject compounds, particularly such compositions copackaged with
instructions describing use of the composition to treat an
applicable disease or condition (herein).
The compositions for administration can take the form of bulk
liquid solutions or suspensions, or bulk powders. More commonly,
however, the compositions are presented in unit dosage forms to
facilitate accurate dosing. The term "unit dosage forms" refers to
physically discrete units suitable as unitary dosages for human
subjects and other mammals, each unit containing a predetermined
quantity of active material calculated to produce the desired
therapeutic effect, in association with a suitable pharmaceutical
excipient. Typical unit dosage forms include prefilled, premeasured
ampules or syringes of the liquid compositions or pills, tablets,
capsules, lozenges or the like in the case of solid compositions.
In such compositions, the compound is usually a minor component
(from about 0.1 to about 50% by weight or preferably from about 1
to about 40% by weight) with the remainder being various vehicles
or carriers and processing aids helpful for forming the desired
dosing form.
Suitable excipients or carriers and methods for preparing
administrable compositions are known or apparent to those skilled
in the art and are described in more detail in such publications as
Remington's Pharmaceutical Science, Mack Publishing Co, NJ (1991).
In addition, the compounds may be advantageously used in
conjunction with other therapeutic agents as described herein or
otherwise known in the art, particularly other anti-necrosis
agents. Hence the compositions may be administered separately,
jointly, or combined in a single dosage unit.
The amount administered depends on the compound formulation, route
of administration, etc. and is generally empirically determined in
routine trials, and variations will necessarily occur depending on
the target, the host, and the route of administration, etc.
Generally, the quantity of active compound in a unit dose of
preparation may be varied or adjusted from about 1, 5, 25 or 100 to
about 5, 25, 100, 500, 1000 or 2000 mg, according to the particular
application. In a particular embodiment, unit dosage forms are
packaged in a multipack adapted for sequential use, such as
blisterpack, comprising sheets of at least 6, 9 or 12 unit dosage
forms. The actual dosage employed may be varied depending upon the
requirements of the patient and the severity of the condition being
treated. Determination of the proper dosage for a particular
situation is within the skill of the art. Generally, treatment is
initiated with smaller dosages which are less than the optimum dose
of the compound. Thereafter, the dosage is increased by small
amounts until the optimum effect under the circumstances is
reached. For convenience, the total daily dosage may be divided and
administered in portions during the day if desired.
The compounds can be administered by a variety of methods
including, but not limited to, parenteral, topical, oral, or local
administration, such as by aerosol or transdermally, for
prophylactic and/or therapeutic treatment. Also, in accordance with
the knowledge of the skilled clinician, the therapeutic protocols
(e.g., dosage amounts and times of administration) can be varied in
view of the observed effects of the administered therapeutic agents
on the patient, and in view of the observed responses of the
disease to the administered therapeutic agents.
The therapeutics of the invention can be administered in a
therapeutically effective dosage and amount, in the process of a
therapeutically effective protocol for treatment of the patient.
For more potent compounds, microgram (ug) amounts per kilogram of
patient may be sufficient, for example, in the range of about 1,
10, 100, 1000, 10000, 20000 ug/kg to about 10, 100, 1000, 10000,
20000 or 80000 ug/kg of patient weight though optimal dosages are
compound specific, and generally empirically determined for each
compound.
In general, routine experimentation in clinical trials will
determine specific ranges for optimal therapeutic effect, for each
therapeutic, each administrative protocol, and administration to
specific patients will also be adjusted to within effective and
safe ranges depending on the patient condition and responsiveness
to initial administrations. However, the ultimate administration
protocol will be regulated according to the judgment of the
attending clinician considering such factors as age, condition and
size of the patient as well as compounds potency, severity of the
disease being treated. For example, a dosage regimen of the
compounds can be oral administration of from 10 mg to 2000 mg/day,
preferably 10 to 1000 mg/day, more preferably 50 to 600 mg/day, in
two to four (preferably two) divided doses. Intermittent therapy
(e.g., one week out of three weeks or three out of four weeks) may
also be used.
In particular embodiments thereof, the person to be treated has a
genotype associated with obesity or pathogenic or
medically-undesirable weight gain, such as SNP rs7202116 (G),
rs1421085 (C), or rs9939609 (A), or a surrogate or proxy SNP in
linkage disequilibrium therewith (with respect to the correlative
phenotype; see references below) and having a r.sup.2 value greater
than 0.5; and/or (f) pathogenically expresses or over-expresses FTO
or Fto (e.g. comprises and expresses a multi-copy fto gene). Re
rs7202116 G, see e.g. Yang et al., FTO genotype is associated with
phenotypic variability of body mass index, Nature, Sep. 16, 2012,
doi: 10.1038/nature11401 [epub]; re rs9939609 A, see e.g. Freathy R
M, et al (2008). "Common variation in the FTO gene alters
diabetes-related metabolic traits to the extent expected, given its
effect on BMI". Diabetes 57 (5): 1419-26. doi:10.2337/db07-1466.
PMC 3073395. PMID 18346983; re rs1421085 C, see e.g. Dina C, et
al., (2007). "Variation in FTO contributes to childhood obesity and
severe adult obesity". Nature Genetics 39 (6): 724-6.
doi:10.1038/ng2048. PMID 17496; and for multi-copy fto gene mouse,
see e.g. Church et al., Overexpression of Fto leads to increased
food intake and results in obesity, Nature Genetics, published
online 14 Nov. 2010, doi:10.1038/ng.713.
It is understood that the examples and embodiments described herein
are for illustrative purposes only and that various modifications
or changes in light thereof will be suggested to persons skilled in
the art and are to be included within the spirit and purview of
this application and scope of the appended claims. All
publications, patents, and patent applications cited herein,
including citations therein, are hereby incorporated by reference
in their entirety for all purposes.
EXAMPLES: COMPOUND PREPARATION
Compound 347:
347 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00156##
Step 1: Synthesis of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-oxopropanamide
(2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (1.0 g, 4.4 mmol) in toluene (11
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (10 mL).
Under a nitrogen atmosphere, 60% NaH (0.35 g, 8.8 mmol) was added
to solution of 2-cyano-N,N-diethylacetamide (0.56 g, 4.0 mmol) in
anhydrous THF (15 mL) at -5.degree. C. The resulting suspension was
stirred at -5.degree. C. for 15 min and the THF solution of
3,4-dimethoxy-5-nitrobenzoyl chloride was added over 10 min and
stirred for an additional 1 h at -5.degree. C. The reaction mixture
was warmed to 0.degree. C., quenched by the addition of 1N.HCl
solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL.times.2), the organic layers was
dried with Na.sub.2SO.sub.4 and concentrated in vacuo to give the
title compound as an orange solid (705 mg, 99%). MS [MH].sup.+
calcd for C.sub.16H.sub.19N.sub.3O.sub.6 350.1, found 350.1.
Step 2: Synthesis of
2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl-3-oxopropanamide
(3)
A solution of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-oxopropanamide
(500 mg, 1.43 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (5 mL, 5 mmol) at -15.degree. C. under a nitrogen
atmosphere. The resulting red suspension was stirred for 1 h at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL.times.3). The organic layers were combined, washed
with brine and dried over Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Further purification by Prep-HPLC (0.5% TFA, MeOH/H.sub.2O) gave
the desired product as a bright yellow solid (80 mg, 17%). .sup.1H
NMR (400 MHz, CDCl.sub.3) .delta. 10.92 (s, 1H), 8.28 (d, J=2.0 Hz,
1H), 7.74 (d, J=1.9 Hz, 1H), 7.26 (s, 3H), 5.93 (s, 1H), 3.66 (d,
J=6.0 Hz, 3H), 1.33 (t, J=7.0 Hz, 6H). MS [MH].sup.+ calcd for
C.sub.14H.sub.15N.sub.3O.sub.6 322.0, found 322.0.
Compound 315:
315 was prepared in one synthetic step from
3,4-dihydroxy-5-nitrobenzaldehyde, according to the following
procedure:
##STR00157##
Step 1: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(pyridin-2-yl)acrylonitrile
(2)
A solution of 2-(pyridin-2-yl)acetonitrile (142 mg, 1.2 mmol),
3,4-dihydroxy-5-nitrobenzaldehyde (182 mg, 1 mmol) and NH.sub.4OAc
(462 mg, 6 mmol) in MeOH (10 mL) was heated to reflux for
overnight. LCMS showed no 3,4-dihydroxy-5-nitrobenzaldehyde left.
The reaction mixture was cooled to room temperature. The solid was
filtered and washed by MeOH and H.sub.2O. The solid was
re-dissolved in MeOH (5 mL). 5 mL of 1N aqueous HCl was added to
adjust pH 3-4. The desired product was obtained by filter as a
bright solid (56 mg, 20%). .sup.1H NMR (400 MHz, DMSO) .delta. 8.57
(m, 1H), 8.12 (s, 1H), 7.92 (d, J=2.2 Hz, 1H), 7.84 (td, J=7.8, 1.8
Hz, 1H), 7.70 (d, J=8.1 Hz, 1H), 7.56 (d, J=2.4 Hz, 1H), 7.31-7.25
(m, 1H). MS [MH].sup.+ calcd for C.sub.14H.sub.9N.sub.3O.sub.4
284.0, found 284.0.
Compound 361:
361 was prepared in four synthetic steps from malonamide, according
to the following procedure:
##STR00158##
Step 1: Synthesis of 2-(4,6-dihydroxypyrimidin-2-yl)acetamide
(2)
To a solution of NaOEt (21% in EtOH, 167 mL, 450 mmol) in EtOH (170
mL) was added malonamide (22.9 g, 224 mmol). After being refluxed
for 2 hours, half of EtOH was removed under reduced pressure and
the precipitated solid was filtered and dried under high vacuum for
overnight. The dried solid sodium salt (24 g) was dissolved in
ice-cold H.sub.2O (70 mL) and brought to pH 2-3 using 3N. HCl (50
mL), recrystallization from water gave
2-(4,6-dihydroxypyrimidin-2-yl)acetamide as a pale yellow solid
(6.28 g, 33%).
Step 2: Synthesis of 2-(4,6-dichloropyrimidin-2-yl)acetonitrile
(3)
To a solution of 2-(4,6-dihydroxypyrimidin-2-yl)acetamide (6.28 g,
37.1 mmol) in POCl.sub.3 (19 mL, 204 mmol) was placed in a flask
which was then attached to a reflux condenser. Through the
condenser was added N,N-dimethylaniline (10 mL, 79 mmol). The
mixture was warmed cautiously in an oil bath which is quickly
removed when the reaction began. After the initial vigorous
reaction had subsided, the reaction was refluxed for ten minutes
longer. The hot material was poured over 100 g ice and the
resulting suspension was extracted (DCM). The combined organic
layers were dried (Na.sub.2SO.sub.4) and concentrated under reduced
pressure. The product was purified by column chromatography
(SiO.sub.2, PE/EA=4/1) to provide the desired product as a yellow
solid (5.1 g, 27.1 mmol). MS [MH].sup.+ calcd for
C.sub.6H.sub.3Cl.sub.2N.sub.3 189.0, found 189.0.
Step 3: Synthesis of 2-(pyrimidin-2-yl)acetonitrile (4)
To a solution of 2-(4,6-dichloropyrimidin-2-yl)acetonitrile (2.2 g,
11.7 mmol) and triethylamine (3.0 mL, 20.8 mmol) in ethyl
acetate/MeOH (1/1, 40 mL) was added 10% Pd/C (400 mg) and the
solution was vigorously stirred for 2.5 hours under H.sub.2
atmosphere (1 atm). The reaction was filtered through celite and
washed the celite with MeOH. The combined filtrates were
concentrated under reduced pressure and purified by flash
chromatography (SiO.sub.2, PE/EA=1/1) to give the
2-(pyrimidin-2-yl)acetonitrile as a pale red liquid (618 mg, 54%).
MS [MH].sup.+ calcd for C.sub.6H.sub.5N.sub.3 120.1, found
120.1.
Step 4: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(pyrimidin-2-yl)acrylonitrile
(6)
A solution of 2-(pyrimidin-2-yl)acetonitrile (120 mg, 1 mmol),
3,4-dihydroxy-5-nitrobenzaldehyde (182 mg, 1 mmol) and NH.sub.4OAc
(462 mg, 6 mmol) in MeOH (10 mL) was heated to reflux for 5 hours.
LCMS showed no starting materials left. The solid was filtered and
washed by MeOH and H.sub.2O, then dissolved in MeOH (5 mL). 5 mL of
1N.HCl was added to adjust pH 3.about.4, the solid was filtered and
dried in vacuo to give the desired product as a bright yellow solid
(250 mg, 88%). .sup.1H NMR (400 MHz, DMSO) .delta. 8.78 (d, J=4.8
Hz, 2H), 8.35 (s, 1H), 7.96 (d, J=2.5 Hz, 1H), 7.59 (d, J=2.5 Hz,
1H), 7.32 (t, J=4.8 Hz, 1H). MS [MH].sup.+ calcd for
C.sub.13H.sub.8N.sub.4O.sub.4 285.0, found 285.0.
Compound 395:
395 was prepared in four synthetic steps from 4-methylpyrimidine,
according to the following procedure:
##STR00159##
Step 1: Synthesis of 4-(chloromethyl)pyrimidine (2)
4-methylpyrimidine (53.1 mmol, 5 g) was dissolved in CHCl.sub.3
(100 mL), the mixture was heated to 75.degree. C., then
1,3,5-trichloro-1,3,5-triazinane-2,4,6-trione (26.6 mmol, 6.2 g)
was added slowly in two portions. The mixture was stirred at
75.degree. C. overnight. After the completion of the reaction, it
was filtered and concentrated in vacco. The residue was purified by
column chromatograph (silica gel, PE/EA=30/1 to 10/1) to obtain the
desired product (1.64 g, 24%) as a yellow oil. .sup.1H-NMR (400
MHz, CDCl.sub.3) .delta.(ppm) 9.16 (s, 1H), 8.77 (d, J=5.2 Hz, 1H),
7.54 (d, J=5.1 Hz, 1H), 4.60 (s, 2H); MS [MH]+ calcd for
C.sub.5H.sub.6ClN.sub.2 129.0, found 129.1;
Step 2: Synthesis of 2-(pyrimidin-4-yl)acetonitrile (3)
Anhydrous potassium carbonate (7.78 mmol, 1.08 g), sodium iodide
(3.89 mmol, 583 mg) and trimethylsilanecarbonitrile (5.83 mmol, 579
mg) were dissolved in acetonitrile (12 mL), the mixture was heated
to 50.degree. C. Finally 4-(chloromethyl)-pyrimidine (3.89 mmol,
500 mg) was dropped into the reaction mixture. The mixture was
stirred 50.degree. C. for 2 hours. Then it was concentrated in
vacco and the residue was purified by column chromatograph (silica
gel, PE/EA=1/1) to obtain the desired product (120 mg, 26%) as a
black oil. .sup.1H-NMR (400 MHz, CDCl.sub.3) .delta. (ppm) 9.21 (s,
1H), 8.81 (d, J=5.2 Hz, 1H), 7.52 (d, J=5.0 Hz, 1H), 3.94 (s, 2H);
MS [MH]+ calcd for C.sub.6H.sub.6N.sub.3 120.1, found 120.2.
Step 3: Synthesis of
3-(3,4-dihydroxy-5-nitrophenyl)-2-(pyrimidin-4-yl)acrylonitrile
(4)
A mixture of 2-(pyrimidin-4-yl)acetonitrile (0.95 mmol, 113 mg),
3,4-dihydroxy-5-nitrobenzaldehyde (0.79 mmol, 145 mg) and ammonium
acetate (4.75 mmol, 366 mg) in methanol (8 mL) was stirred at
80.degree. C. for 4 hours, then it was filtered and washed with
methanol and water to obtain the desired product (200 mg, 89%).
.sup.1H-NMR (400 MHz, DMSO) .delta.(ppm) 9.08 (s, 1H), 8.72 (d,
J=5.5 Hz, 1H), 8.31 (s, 1H), 8.02 (s, 1H), 7.74 (d, J=5.5 Hz, 1H),
7.59 (s, 1H), 7.08 (s, 2H); MS [MH].sup.- calcd for
C.sub.13H.sub.7N.sub.4O.sub.4 283.1, found 283.0;
Compound 505:
505 was prepared in three synthetic steps from 3-chloropyridazine,
according to the following procedure:
##STR00160##
Step 1: Synthesis of tert-butyl 2-cyano-2-(pyridazin-3-yl)acetate
(2)
To a solution of 3-chloropyridazine (0.5 g, 4.38 mmol) in NMP (2.5
mL) was added potassium carbonate (1.8 g, 13.15 mmol). Then
Cert-Butyl 2-cyanoacetate (0.88 mL, 6.14 mmol) was added. The
yellow suspension was warmed up to 80.degree. C. and stirred 3
hours at 80.degree. C. The brown suspension was cooled down to room
temperature. Then it was added to water (10 mL). The brown solution
was acidified with HCl (gas evolution, strong foaming) There was a
precipitation. The suspension was filtrated and the filter cake was
washed with water. The filter cake was dissolved in ethyl acetate,
dried with Na.sub.2SO.sub.4, filtrated and the organic phase
evaporated to yield 600 mg of desired product as a yellow oil.
.sup.1H-NMR (400 MHz, CDCl.sub.3) .delta. (ppm): 14.3 (bs, 1H),
7.68 (dd, 1H), 7.35 (d, 1H), 1.55 (s, 9H). MS [MH].sup.+ calcd for
C.sub.10H.sub.11N.sub.3O.sub.2 206.1, found 206.1;
Step 2: Synthesis of 2-(pyridazin-3-yl)acetonitrile (3)
The product prepared above was combined with TsOH (142 mg) in
toluene (50 mL). After being stirred at refluxing for 12 hours, the
reaction was cooled to 25.degree. C., diluted with sat. NaHCO.sub.3
and extracted (10 percent MeOH/CH.sub.2Cl.sub.2.times.3). The
organic layers were washed with brine, dried with Na2SO.sub.4,
filtered and concentrated under reduced pressure. Purification of
the crude material by flash chromatography (silica gel, 40-45
percent EtOAc/Hexanes) gave the desired product (87 mg, 17% for two
steps) as light yellow oil. MS [MH].sup.+ calcd for
C.sub.6H.sub.5N.sub.3 120.0, found 120.0.
Step 3: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(pyridazin-3-yl)acrylonitrile
(4)
A mixture of 2-(pyrazin-2-yl)acetonitrile (87 mg, 0.73 mmol),
3,4-dihydroxy-5-nitrobenzaldehyde (0.79 mmol, 145 mg) and ammonium
acetate (366 mg, 4.75 mmol) in methanol (8 mL) was stirred at
80.degree. C. for 4 hours. Then it was filtered and washed with
methanol and water, and dried in vacuo to obtain the desired
product (155 mg, 75%) as a yellow solid. .sup.1H NMR (400 MHz,
DMSO) .delta. 10.92 (s, 2H), 9.25 (d, J=4.8 Hz, 1H), 8.43 (s, 1H),
8.20 (d, J=8.7 Hz, 1H), 8.08 (d, J=2.0 Hz, 1H), 7.95 (d, J=2.0 Hz,
1H), 7.85 (dd, J=8.7, 4.9 Hz, 1H). MS [MH].sup.- calcd for
C.sub.6H.sub.5N.sub.3 283.1, found 283.0.
Compound 331:
331 was prepared in one synthetic step from
3,4-dihydroxy-5-nitrobenzaldehyde, according to the following
procedure:
##STR00161##
Step 1: Synthesis of
(E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-(thiazol-2-yl)acrylamide
(2)
A solution of 2-cyano-N-(thiazol-2-yl)acetamide (184 mg, 1.1 mmol),
3,4-dihydroxy-5-nitrobenzaldehyde (200 mg, 1.1 mmol) and
NH.sub.4OAc (462 mg, 6 mmol) in MeOH (10 mL) was heated to reflux
for overnight. LCMS showed no 3,4-dihydroxy-5-nitrobenzaldehyde
left. The reaction mixture was cooled to room temperature. The
solid was filtered and washed by MeOH and H.sub.2O. The solid was
re-dissolved in MeOH (5 mL). 5 mL of 1N aqueous HCl was added to
adjust pH 3-4. The desired product was obtained by filter as a
bright solid (90 mg, 25%). .sup.1H NMR (400 MHz, DMSO) .delta. 8.17
(s, 1H), 7.95 (s, 1H), 7.50 (s, 2H), 7.20 (s, 1H). MS [MH].sup.+
calcd for C.sub.13H.sub.8N.sub.4O.sub.5S 333.0, found 333.0.
Compound 394:
394 was prepared in four synthetic steps from benzene-1,2-diamine,
according to the following procedure:
##STR00162##
Step 1: Synthesis of 1-(1H-benzo[d]imidazol-2-yl)ethanone (2)
A mixture of 2-oxosuccinic acid (4.9 g, 37 mmol),
benzene-1,2-diamine (4 g, 37 mmol) and 4N hydrochloride solution (9
mL) in MeOH (30 mL) was refluxed for 7 hours. After the completion
of the reaction, it was concentrated in vacuo to remove the
solvent. The residue was dissolved in ethyl acetate, washed with
aq. sodium bicarbonate and brine. The organic layers were combined
and concentrated under reduced pressure. The residue was purified
by column chromatograph (silica gel, PE/EA=5/1) to obtain the
desired product (4 g, 67%). MS [MH].sup.+ calcd for
C.sub.9H.sub.9N.sub.2O 161.06, found 161.1.
Step 2: Synthesis of 1-(1H-benzo[d]imidazol-2-yl)-2-bromoethanone
(3)
1-(1H-benzo[d]imidazol-2-yl)ethanone (4 g, 25 mmol) was dissolved
in tetrachloromethane (50 mL). 1-Bromopyrrolidine-2,5-dione (5.3 g,
30 mmol) and 2,2'-(diazene-1,2-diyl)bis(2-methylpropane-nitrile)
(411 mg, 2.5 mmol) were added. The mixture was stirred at
100.degree. C. for 2 hours, then it was concentrated in vacuo and
re-dissolved in ethyl acetate. The organic layer was washed with
water and concentrated to obtain the crude product (2 g, 33%),
which was used in the next step without further purification. MS
[MH].sup.+ calcd for C.sub.9H.sub.8BrN.sub.2O 238.97, found
239.0.
Step 3: Synthesis of
3-(1H-benzo[d]imidazol-2-yl)-3-oxopropanenitrile (4)
A mixture of 1-(1H-benzo[d]imidazol-2-yl)-2-bromoethanone (2 g, 8.4
mmol), trimethylsilane-carbonitrile (1.66 g, 16.7 mmol), TBAF (2.2
g, 8.4 mmol) in dichloromethane (15 mL) was stirred at room
temperature for 24 hours. Then it was concentrated in vacuo and
re-dissolved in ethyl acetate. The organic layer was washed with
water and concentrated to obtain the crude product (400 mg, 26%),
which was used in the next step without further purification. MS
[MH].sup.+ calcd for C.sub.10H.sub.7N.sub.3O 186.06, found
186.1.
Step 4: Synthesis of
2-(1H-benzo[d]imidazole-2-carbonyl)-3-(3,4-dihydroxy-5-nitrophenyl)acrylo-
-nitrile (5)
A solution of 3,4-dihydroxy-5-nitrobenzaldehyde (107 mg, 0.59 mmol)
and 3-(1H-benzo[d]imida-zole-2-yl)-3-oxopropanenitrile (130 mg, 0.7
mmol) and NH.sub.4OAc (273 mg, 3.54 mmol) in methanol (10 mL) was
heated to reflux for overnight. LCMS showed the desired product was
formed, the reaction mixture was cooled to room temperature and
concentrated in vacuo to remove the solvent. The desired product
was obtained by Prep-HPLC (50 mg, 24%). .sup.1H-NMR (400 MHz,
DMSO-d.sup.6) .delta. (ppm) 12.63 (s, 1H), 8.95 (s, 1H), 7.85 (s,
1H), 7.76 (d, J=8.2 Hz, 1H), 7.65 (s, 1H), 7.50 (t, J=7.5 Hz, 1H),
7.38-7.26 (m, 2H), 7.12 (s, 2H). MS [MH].sup.+ calcd for
C.sub.17H.sub.11N.sub.4O.sub.5 351.07, found 351.0.
Compound 382:
382 was prepared in two synthetic steps from ethyl 2-cyanoacetate,
according to the following procedure:
##STR00163##
Step 1: Synthesis of 3-morpholino-3-oxopropanenitrile (2)
A mixture of sodium ethoxide (0.1 mmol) in ethanol (3 mL), ethyl
cyanoacetate (1.13 g, 10 mmol) and morpholine (0.85 g, 10 mmol) was
stirred at room temperature for 24 hours. The precipitate was
collected by filtration, washed with diethylether and
recrystallised in ethanol to provide a white solid of
3-morpholino-3-oxopropanenitrile (0.56 g, 35%).
Step 2: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(piperidine-1-carbonyl)acrylonitril-
e (3)
A solution of 3-morpholino-3-oxopropanenitrile (300 mg, 2.0 mmol),
3,4-dihydroxy-5-nitro-benzaldehyde (188 mg, 1.1 mmol) and
NH.sub.4OAc (462 mg, 6 mmol) in MeOH (10 mL) was heated to reflux
for 5 hours. LCMS showed no 3,4-dihydroxy-5-nitrobenzaldehyde left.
The reaction mixture was cooled to room temperature, concentrated
in vacuo to dryness. Further purification by Prep-HPLC (0.5% TFA,
MeOH/H.sub.2O) afforded the desired product as a yellow solid (60
mg, 19%). .sup.1H NMR (400 MHz, DMSO) .delta. 10.87 (s, 2H), 7.94
(d, J=2.1 Hz, 1H), 7.77 (d, J=2.1 Hz, 1H), 7.68 (s, 1H), 3.56-3.66
(m, 8H). MS [MH].sup.+ calcd for C.sub.14H.sub.13N.sub.3O.sub.6
320.1, found 320.0.
Compound 351:
351 was prepared in three synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00164##
Step 1: Synthesis of 3,4-dimethoxy-5-nitrobenzoyl chloride (2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
for 15 hours. The solvent was removed under reduced pressure. The
resulting yellowish solid (500 mg, 92%) was used in the next step
without further workup.
Step 2: Synthesis of
3-(3,4-dimethoxy-5-nitrophenyl)-3-oxo-2-(pyridin-2-yl)propanenitrile
(3)
Under a nitrogen atmosphere, NaH (60% w/w, 176 mg, 4.4 mmol) was
added to solution of 2-(pyridin-2-yl)acetonitrile (236 mg, 2.0
mmol) in anhydrous THF (10 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride (500 mg, 2.2 mmol) in THF
(5 mL) was added over 10 min and stirred for an additional 1 hour
at -5.degree. C. The reaction mixture was warmed to 0.degree. C.,
quenched by the addition of 1N.HCl solution (4 mL) and stirred for
10 min at room temperature. The mixture was extracted with ethyl
acetate (25 mL.times.2). The combined organic layers were dried
with anhydrous sodium sulfate and concentrated in vacuo to give the
desired product (425 mg, 64%). MS [MH].sup.+ calcd for C16H14N3O5
328.09, found 328.1.
Step 3: Synthesis of
3-(3,4-dihydroxy-5-nitrophenyl)-3-oxo-2-(pyridin-2-yl)propanenitrile
(4)
A solution of
3-(3,4-dimethoxy-5-nitrophenyl)-3-oxo-2-(pyridin-2-yl)propanenitrile
(425 mg, 1.3 mmol) in dichloromethane (5 mL) was added 1.0 M
solution of BBr.sub.3 in dichloromethane (10 mL, 10 mmol) at
-15.degree. C. under a nitrogen atmosphere. The resulting
suspension was stirred for 1 hours at -15.degree. C. and allowed to
warm to room temperature for overnight. The reaction was quenched
slowly by the addition of water (4 mL) and stirred for another 30
min. The aqueous phase was extracted with ethyl acetate (30
mL.times.3). The organic layers were combined, washed with brine
and dried over with anhydrous sodium sulfate. The solvent was
removed under reduced pressure to give the crude product. Further
purification was conducted by Prep-HPLC to obtain the desired
product (65 mg, 17%). .sup.1H-NMR (400 MHz, DMSO-d.sup.6)
.delta.(ppm) 16.11 (s, 1H), 10.65 (s, 2H), 8.38 (t, J=5.7 Hz, 1H),
8.28-7.96 (m, 1H), 7.84 (d, J=2.0 Hz, 1H), 7.55 (d, J=2.1 Hz, 1H),
7.47 (d, J=8.7 Hz, 1H), 7.26 (t, J=6.6 Hz, 1H). MS [MH].sup.+ calcd
for C.sub.14H.sub.10N.sub.3O.sub.5 300.05, found 300.0.
Compound 371:
371 was prepared in two synthetic steps from 2-cyanoacetyl
chloride, according to the following procedure:
##STR00165##
Step 1: Synthesis of 3-oxo-3-(piperidin-1-yl)propanenitrile (2)
A mixture of piperidine (5 mL, 50.6 mmol), in DCM (25 mL) was added
2-cyanoacetyl chloride (5 mL) at 0.degree. C., then warmed to room
temperature overnight. The reaction mixture was quenched by
H.sub.2O, and concentrated in vacuo to dryness, the residue was
purified by column chromatography (SiO.sub.2, PE/EA=1/1) to give
the 3-oxo-3-(piperidin-1-yl)propanenitrile as a yellow oil (500 mg,
7%). MS [MH].sup.+ calcd for C.sub.8H.sub.12N.sub.2O 153.1, found
153.1.
Step 2: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(piperidine-1-carbonyl)acrylonitril-
e (3)
A solution of 3-oxo-3-(piperidin-1-yl)propanenitrile (300 mg, 2
mmol), 3,4-dihydroxy-5-nitrobenzaldehyde (273 mg, 1.5 mmol) and
NH.sub.4OAc (924 mg, 12 mmol) in MeOH (15 mL) was heated to reflux
for 3 hours. The solid was filtered and washed by MeOH and H.sub.2O
to give the crude product. The solid dissolved in MeOH (5 mL) was
added 1N.HCl (0.5 mL), the color was changed and the solid was
formed, the solid was filtered and washed by H.sub.2O, dried in
vacuo to give the
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(piperidine-1-carbonyl)acrylonitril-
e as a bright yellow solid (60 mg, 13%). .sup.1H NMR (400 MHz,
DMSO) .delta. 10.86 (s, 2H), 7.92 (d, J=2.1 Hz, 1H), 7.75 (d, J=2.0
Hz, 1H), 7.63 (s, 1H), 3.56-3.45 (m, 4H), 1.55-1.62 (m, 6H). MS
[MH].sup.+ calcd for C.sub.15H.sub.15N.sub.3O.sub.5 318.3, found
318.0.
Compound 518:
518 was prepared in two synthetic steps from
2-(pyridin-3-yl)acetonitrile, according to the following
procedure:
##STR00166##
Step 1: Synthesis of 3-(cyanomethyl)pyridine 1-oxide (2)
A solution of 2-(pyridin-3-yl)acetonitrile (625 mg, 5.3 mmol) and
m-CPBA (1.36 g, 7.95 mmol) in CHCl.sub.3 (20 mL) was stirred at
room temperature for overnight. The reaction mixture was quenched
by sat.NaHCO.sub.3 and extracted by DCM and MeOH (DCM/MeOH=10/1).
The combined organic layers were dried over anhydrous
Na.sub.2SO.sub.4, filtered and dried in vacuo to give the crude
product as a white solid (780 mg, >100%), which was used to the
next step without further purification. MS [MH].sup.+ calcd for
C.sub.7H.sub.6N.sub.2O 135.0 found 135.0.
Step 2: Synthesis of
(E)-3-(1-cyano-2-(3,4-dihydroxy-5-nitrophenyl)vinyl)pyridine
1-oxide (3)
A solution of 3-(cyanomethyl)pyridine 1-oxide (400 mg, 3.0 mmol),
3,4-dihydroxy-5-nitro-benzaldehyde (270 mg, 1.5 mmol) and
NH.sub.4OAc (693 mg, 9 mmol) in MeOH (10 mL) was heated to reflux
for overnight. LCMS showed no 3,4-dihydroxy-5-nitrobenzaldehyde
left. The reaction mixture was cooled to room temperature. The
solid was filtered and washed by MeOH and H.sub.2O. The solid was
re-dissolved in MeOH (5 mL). 5 mL of 1N aqueous HCl was added to
adjust pH 3-4. The desired product was obtained by filter as a
bright solid (110 mg, 18%). .sup.1H NMR (301 MHz, DMSO) .delta.
13.71 (s, 1H), 10.89 (s, 2H), 8.65 (s, 1H), 8.26 (d, J=6.2 Hz, 1H),
8.14 (s, 1H), 7.99 (d, J=2.0 Hz, 1H), 7.84 (d, J=2.0 Hz, 1H),
7.67-7.50 (m, 2H). MS [MH].sup.+ calcd for
C.sub.14H.sub.9N.sub.3O.sub.5 300.0 found 300.0.
Compound 523:
523 was prepared in three synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00167##
Step 1: Synthesis of 3,4-dimethoxy-5-nitrobenzoyl chloride (2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.76 mL, 10.56 mmol) and
anhydrous DMF (0.02 mL, 0.44 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (1 g, 4.4 mmol) in toluene (20
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The solvent was removed under reduced
pressure. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride (1 g, 93%) was used in the
next step without further workup.
Step 2: Synthesis of
3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(pyrazin-2-yl)acrylonitrile
(3)
Under a nitrogen atmosphere, 60% NaH (336 mg, 8.4 mmol) was added
to solution of 2-(pyrazin-2-yl)acetonitrile (500 mg, 4.2 mmol) in
anhydrous THF (5 mL) at -5.degree. C. The resulting suspension was
stirred at -5.degree. C. for 15 min and the THF solution of
3,4-dimethoxy-5-nitrobenzoyl chloride (500 mg, 4.07 mmol) was added
over 10 min and stirred for an additional 1 hour at -5.degree. C.
The reaction mixture was warmed to 0.degree. C., quenched by the
addition of 1N.HCl solution (8 mL) and stirred for 10 min at room
temperature, then extracted with ethyl acetate (30 mL.times.3), the
organic layer was dried with anhydrous sodium sulfate and
concentrated in vacuo to obtain the desired product (440 mg, 33%).
MS [MH].sup.- calcd for C.sub.15H.sub.11N.sub.4O.sub.5 327.08,
found 327.1.
Step 3: Synthesis of
3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-2-(pyrazin-2-yl)acrylonitrile
(4)
To a solution of
3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(pyrazin-2-yl)acrylonitrile
(200 mg, 0.61 mmol) in anhydrous dichloromethane (5 mL) was added
1.0 M solution of BBr.sub.3 in dichloromethane (3 mL, 3 mmol) at
-15.degree. C. under a nitrogen atmosphere. The resulting
suspension was stirred for 1 hour at -15.degree. C. and allowed to
warm to room temperature for overnight. The reaction was quenched
by the addition of water (2 mL) and stirred for another 30 min. The
aqueous phase was extracted with ethyl acetate (30 mL.times.3). The
organic layers were combined, washed with brine and dried over
anhydrous sodium sulfate. The solvent was removed under reduced
pressure to give the crude product. Further purification was
conducted by Prep-HPLC to obtain the desired product (35 mg, 19%).
.sup.1H-NMR (400 MHz, DMSO-d.sup.6) .delta.(ppm) 15.85 (s, 1H),
10.75 (s, 2H), 8.88 (s, 1H), 8.34 (d, J=3.7 Hz, 1H), 8.22 (d, J=2.5
Hz, 1H), 7.88 (d, J=2.1 Hz, 1H), 7.56 (d, J=2.1 Hz, 1H). MS
[MH].sup.- calcd for C.sub.13H.sub.7N.sub.4O.sub.5 299.05, found
299.0.
Compound 525:
525 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00168##
Step 1: Synthesis of
(E)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(pyrimidin-4-yl)acrylonit-
rile (2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to solution of 2-(pyrimidin-4-yl)acetonitrile (0.44 g, 2.0 mmol) in
anhydrous THF (10 mL) at -5.degree. C. The resulting suspension was
stirred at -5.degree. C. for 15 min and the THF solution of
3,4-dimethoxy-5-nitrobenzoyl chloride was added over 10 min and
stirred for an additional 1 hour at -5.degree. C. The reaction
mixture was warmed to 0.degree. C., quenched by the addition of
1N.HCl solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL.times.2), the organic layers was
dried with Na.sub.2SO.sub.4 and concentrated in vacuo to give the
title compound as an orange solid (550 mg, 85%). MS [MH].sup.+
calcd for C.sub.15H.sub.12N.sub.4O.sub.5 329.0 found 329.0.
Step 2: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-2-(pyrimidin-4-yl)acrylonit-
rile (3)
A solution of
(E)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(pyrimidin-4-yl)acrylonit-
rile (250 mg, 0.76 mmol) in DCM (5 mL) was added BBr.sub.3 (0.5 mL,
5 mmol) at -5.degree. C. under a nitrogen atmosphere. The resulting
red suspension was stirred for 1 h at -5.degree. C. and allowed to
warm to room temperature overnight. The reaction was quenched by
the addition of H.sub.2O (2 mL) and stirred for 30 min. The aqueous
phase was extracted with ethyl acetate (30 mL.times.3). The organic
layers were combined, washed with brine and dried over
Na.sub.2SO.sub.4. The solvent was eliminated under reduced pressure
to give the crude product. Further purification by Prep-HPLC (0.5%
TFA, MeOH/H.sub.2O) gave the desired product as a bright yellow
solid (46 mg, 19%). .sup.1H NMR (400 MHz, DMSO) .delta. 15.35 (s,
1H), 10.67 (s, 2H), 8.95-7.16 (m, 5H). MS [MH].sup.+ calcd for
C.sub.15H.sub.14N.sub.2O.sub.5 337.0 found 301.0 (free).
Compound 503:
503 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00169##
It Step 1: Synthesis of
3-(3,4-dimethoxy-5-nitrophenyl)-3-oxo-2-(thiazol-2-yl)propanenitrile
(2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 2-(thiazol-2-yl) acetonitrile (0.24 g, 2.0 mmol)
in anhydrous THF (5 mL) at -5.degree. C. The resulting suspension
was stirred at -5.degree. C. for 15 min and the solution of
3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10 min
and stirred for an additional 1 hour at -5.degree. C. The reaction
mixture was warmed to 0.degree. C., quenched by the addition of
1N.HCl solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL*2), the organic layers was dried
with Na.sub.2SO.sub.4 and concentrated in vacuo to give the title
compound as an orange solid (240 mg, 39%). MS [MH].sup.+ calcd for
C.sub.14H.sub.11N.sub.3O.sub.5S 334.3, found 334.3.
Step 2: Synthesis of
3-(3,4-dihydroxy-5-nitrophenyl)-3-oxo-2-(thiazol-2-yl)propanenitrile
(3)
A solution of
3-(3,4-dimethoxy-5-nitrophenyl)-3-oxo-2-(thiazol-2-yl)propanenitrile
(224 mg, 0.67 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (3 mL, 3 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL.times.3). The organic layers were combined, washed
with brine and dried over Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Further purification by Prep-HPLC (0.5% TFA, MeOH/H.sub.2O) gave
the desired product as a bright yellow solid (24 mg, 12%). .sup.1H
NMR (400 MHz, DMSO) .delta. 7.88 (d, J=2.0 Hz, 1H), 7.60 (d, J=4.0
Hz, 1H), 7.56 (d, J=2.0 Hz, 1H), 7.31 (d, J=4.0 Hz, 1H). MS
[MH].sup.- calcd for C.sub.12H.sub.7N.sub.3O.sub.5S 304.0, found
304.0.
Compound 374:
374 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00170##
Step 1: Synthesis of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-oxo-N-(thiazol-2-yl)propanamide
(2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to solution of 2-cyano-N-(thiazol-2-yl)acetamide (0.35 g, 2.0 mmol)
in anhydrous THF (10 mL) at -5.degree. C. The resulting suspension
was stirred at -5.degree. C. for 15 min and the THF solution of
3,4-dimethoxy-5-nitrobenzoyl chloride was added over 10 min and
stirred for an additional 1 hour at -5.degree. C. The reaction
mixture was warmed to 0.degree. C., quenched by the addition of
1N.HCl solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL.times.2), the organic layers was
dried with Na.sub.2SO.sub.4 and concentrated in vacuo to give the
title compound as an orange solid (510 mg, 67%). MS [MH].sup.+
calcd for C.sub.15H.sub.12N.sub.4O.sub.6S 377.0, found 377.0.
Step 2: Synthesis of
2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-3-oxo-N-(thiazol-2-yl)propanamide
(3)
A solution of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-oxo-N-(thiazol-2-yl)propanamide
(400 mg, 1.1 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (5 mL, 5 mmol) at -15.degree. C. under a nitrogen
atmosphere. The resulting red suspension was stirred for 1 h at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL.times.3). The organic layers were combined, washed
with brine and dried over Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Further purification by Prep-HPLC (0.5% TFA, MeOH/H.sub.2O) gave
the desired product as a bright yellow solid (100 mg, 28%). .sup.1H
NMR (400 MHz, DMSO) .delta. 7.88 (d, J=2.0 Hz, 1H), 7.60 (d, J=4.0
Hz, 1H), 7.56 (d, J=2.0 Hz, 1H), 7.31 (d, J=4.0 Hz, 1H). MS
[MH].sup.+ calcd for C.sub.13H.sub.8N.sub.4O.sub.6S 349.0, found
349.0.
Compound 655:
655 was prepared in four synthetic steps from methyl
5-chloropyrazine-2-carboxylate, according to the following
procedure:
##STR00171##
Step 1: Synthesis of methyl
5-(2-(tert-butoxy)-1-cyano-2-oxoethyl)pyrazine-2-carboxylate
(2)
A solution of tert-butyl 2-cyanoacetate (2.1 g, 15 mmol) and t-BuOK
(1.6 g, 15 mmol) in dry THF (50 mL) stirred at rt for 30 min, then
methyl 5-chloropyrazine-2-carboxylate (1.7 g, 10.0 mmol) was added,
the reaction mixture was heated to reflux overnight, After the
reaction was completed, cooled it to rt and quenched by H.sub.2O
(100 mL), the solid was filtered and dried in vacuo to afford the
desired product as yellow solid (1.7 g, 61%). MS [M+H].sup.+ calcd
for C.sub.13H.sub.15N.sub.3O.sub.4 278.1, found 278.1.
Step 2: Synthesis of methyl 5-(cyanomethyl)pyrazine-2-carboxylate
(3)
A solution of
5-(2-(tert-butoxy)-1-cyano-2-oxoethyl)pyrazine-2-carboxylate (1.7
g, 6.14 mmol) and p-TsOH (314 mg, 1.84 mmol) was heated to reflux
for 3 h, then TLC showed no starting materials left. The reaction
mixture was quenched by H.sub.2O (5 mL), extracted by EA, washed
with sat. NaHCO.sub.3, the organic layer was dried with
Na.sub.2SO.sub.4, filtered and dried in vacuo to afford the crude
product, further purification by column chromatography (SiO.sub.2,
100 g, 200-300 m, eluted by PE/EA=5/1) to afford the desired
product methyl 5-(cyanomethyl)pyrazine-2-carboxylate (800 mg, 74%)
as yellow solid. MS [M+H].sup.+ calcd for
C.sub.8H.sub.7N.sub.3O.sub.2 178.1 found 178.1.
Step 3: Synthesis of methyl (Z)-methyl
5-(1-cyano-2-(3,4-dihydroxy-5-nitrophenyl)vinyl)pyrazine-2-carboxylate
(4)
A solution of methyl 5-(cyanomethyl)pyrazine-2-carboxylate (170 mg,
1.0 mmol), 3,4-dihydroxy-5-nitrobenzaldehyde (183 mg, 1.0 mmol) and
NH.sub.4OAc (554 mg, 7.2 mmol) in MeOH (15 mL) was heated to reflux
for 3 hours, then cooled it to room temperature. The solid was
filtered and washed by H.sub.2O (15 mL), The solid was re-dissolved
in MeOH (5 mL). 5 mL of 1N aqueous HCl was added to till pH=3-4.
The desired product was obtained by filter and dried in vacuo as
bright solid (210 mg, 61%). MS [M+H].sup.+ calcd for
C.sub.15H.sub.10N.sub.4O.sub.6 343.0, found 343.0.
Step 4: Synthesis of
(Z)-5-(1-cyano-2-(3,4-dihydroxy-5-nitrophenyl)vinyl)pyrazine-2-carboxylic
acid (5)
A solution of (Z)-methyl
5-(1-cyano-2-(3,4-dihydroxy-5-nitrophenyl)vinyl)pyrazine-2-carboxylate
(150 mg, 0.44 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (2 mL, 2 mmol) at -15.degree. C. under a nitrogen
atmosphere. The suspension was stirred for 1 hour at -15.degree. C.
and allowed to warm to room temperature overnight. The reaction was
quenched by the addition of H.sub.2O (2 mL) and stirred for 30 min.
The aqueous phase was extracted with ethyl acetate (30 mL.times.3).
The organic layers were combined, washed with brine and dried with
Na.sub.2SO.sub.4. The solvent was eliminated in vacuo to give the
crude product. Further purification by Prep-HPLC (0.5% TFA,
MeOH/H.sub.2O) gave the desired product as bright yellow solid (55
mg, 38%). .sup.1H NMR (300 MHz, DMSO) .delta. 9.27 (s, 1H), 9.22
(s,1H), 8.57 (s, 1H), 8.12 (s, 1H), 7.98 (s, 1H), 2.52 (s, 19H),
0.02 (s, 1H). MS [MH].sup.+ calcd for C.sub.14H.sub.8N.sub.4O.sub.6
329.0, found 329.0.
Compound 656:
656 was prepared in two synthetic steps from
5-chloro-1,2,4-thiadiazole, according to the following
procedure:
##STR00172##
Step 1: Synthesis of 2-(1,2,4-thiadiazol-5-yl)acetonitrile (2)
A solution of dry MeCN (226 mg, 11 mmol) in dry THF (25 ml) was
added LiHMDS (5.5 mmol, 5.5 mL) at 0.degree. C., then the mixture
was stirred at 0.degree. C. for 30 min, 5-chloro-1,2,4-thiadiazole
(691 mg, 5.5 mmol) in dry THF (5 mL) was added to the mixture at
0.degree. C., then stirred at rt overnight. The reaction mixture
was quenched by H.sub.2O (1 mL), and extracted by EA (30
mL.times.3), dried with Na.sub.2SO.sub.4, filtered and dried in
vacuo to afford the crude product. Further purification by column
chromatography (SiO.sub.2, 100 g, 200-300 m, eluted by PE/EA=5:1)
gave the desired product (410 mg, 60%) as yellow solid. MS
[M+H].sup.+ calcd for C.sub.4H.sub.3N.sub.3S 126.0, found
126.0.
Step 2: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(1,2,4-thiadiazol-5-yl)acrylonitril-
e (3)
A solution of 2-(1,2,4-thiadiazol-5-yl)acetonitrile (150 mg, 1.2
mmol), 3,4-dihydroxy-5-nitrobenzaldehyde (182 mg, 1 mmol) and
NH.sub.4OAc (462 mg, 6 mmol) in MeOH (10 mL) was heated to reflux
for 5 hours. LC-MS showed no starting materials left. The solid was
filtered and washed by MeO and H.sub.2O, then dissolved in MeOH (5
mL). 5 ml of 1N.HCl was added till pH=3-4. The solid was filtered
and dried in vacuo to give the desired product as bright yellow
solid (200 mg, 69%). .sup.1H NMR (400 MHz, DMSO) .delta. 10.96 (s,
1H), 8.97 (s, 1H), 8.45 (s, 1H), 8.14 (d, J=2.1 Hz, 1H), 7.95 (d,
J=2.2 Hz, 1H). MS [M+H].sup.+ calcd for
C.sub.11H.sub.6N.sub.4O.sub.4S 291.0, found 291.0.
Compound 660:
660 was prepared in two synthetic steps from
(E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylic acid, according
to the following procedure:
##STR00173##
Step 1: Synthesis of
(E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acryloyl chloride
(2)
A solution of (E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylic
acid (25 mg, 0.1 mmol) in DCM (25 ml) was added a drop of DMF and
oxalyl dichloride (25 mg,0.2 mmol). The reaction mixture was heated
till the solid dissolved, cooled to rt, concentrated in vacuo to
dryness. It was used in the next step without purification (27 mg,
100%).
Step 2: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(1,3-oxazinane-3-carbonyl)acrylonit-
rile (3)
A solution of 1,3-oxazinane (9 mg, 0.12 mmol), Et.sub.3N (24 mg,
0.24 mmol) in DCM (3 mL) was added acyl chloride dissolved in DCM
(3 mL) dropwise at 0.degree. C., when the addition was completed,
the reaction mixture was slowly warmed to rt overnight. The
reaction mixture was quenched by H.sub.2O, separated the organic
layer, and dried with Na.sub.2SO.sub.4, concentrated in vacuo to
afford the crude product, further purification by Prep-HPLC (0.5%
TFA, MeOH/H.sub.2O) afford the desired product as yellow solid (5
mg, 16%). 1H NMR (400 MHz, DMSO) .delta. 10.87 (s, 2H), 7.95 (d,
J=2.0 Hz, 1H), 7.76 (d, J=2.1 Hz, 1H), 7.69 (s, 1H), 5.01 (s, 2H),
3.88-3.84 (m, 2H), 3.74 (s, 2H), 1.72-1.66 (m, 2H). MS [M+H]+ calcd
for C.sub.14H.sub.14N.sub.3O.sub.6 320.1 found. 319.9
Compound 661:
661 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00174##
Step 1: Synthesis of
(Z)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(piperidine-1-carbonyl)
acrylonitrile (2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 3-oxo-3-(piperidin-1-yl)propanenitrile (0.30 g,
2.0 mmol) in anhydrous THF (5 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10
min and stirred for an additional 1 hour at -5.degree. C. The
reaction mixture was warmed to 0.degree. C., quenched by the
addition of 1N.HCl solution (4 mL) and stirred for 10 min at room
temperature, extracted by ethyl acetate (25 mL*2), the organic
layers was dried with Na.sub.2SO.sub.4 and concentrated in vacuo to
give the title compound 3 as an orange solid (260 mg, 36%). MS
[MH].sup.+ calcd for C.sub.17H.sub.20N.sub.3O.sub.6 362.1, found
362.1.
Step 2: Synthesis of
(Z)-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-2-(piperidine-1-carbonyl)ac-
rylonitrile (3)
A solution of
(Z)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(piperidine-1-carbonyl)ac-
rylonitrile (180 mg, 0.5 mmol) in DCM (5 mL) was added 1.0 M
solution of BBr.sub.3 in DCM (3 mL, 3 mmol) at -15.degree. C. under
nitrogen atmosphere. The resulting red suspension was stirred for 1
hour at -15.degree. C. and allowed to warm to room temperature
overnight. The reaction was quenched by the addition of H.sub.2O (2
mL) and stirred for 30 min. The aqueous phase was extracted with
ethyl acetate (30 mL.times.3). The organic layers were combined,
washed with brine and dried with Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Further purification by Prep-HPLC (0.5% TFA, MeOH/H.sub.2O) gave
the desired product as yellow solid (63 mg, 38%). 1H NMR (400 MHz,
DMSO) .delta. 10.96 (s, 1H), 7.87 (d, J=2.0 Hz, 1H), 7.49 (s, 1H),
3.65 (s, 4H), 1.60 (s, 6H). MS [M-H]-calcd for
C.sub.15H.sub.16N.sub.3O.sub.6 334.1, found 333.9
Compound 666:
666 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00175##
Step 1: Synthesis of 2-(cyanomethyl)thiazole-4-carboxylic acid
(3)
Under a nitrogen atmosphere, 3-bromo-2-oxopropanoic acid in dry THF
(5 mL) was added to a suspension of 2-cyanoethanethioamide (1.2 g,
12 mmol) in THF (20 ml) at 0.degree. C. The mixture was heated at
70.degree. C. and stirred for 3 hours. The aqueous phase was
extracted with ethyl acetate (30 mL.times.3). The organic layers
were combined, washed with brine and dried with Na.sub.2SO.sub.4.
The solvent was eliminated under reduced pressure to give the crude
product. Further purification by column chromatography (SiO.sub.2,
100 g, 200-300 m, eluted by PE/EA=1/1) afforded the desired product
as white solid (350 mg, 18%).
Step 2: Synthesis of
(E)-2-(1-cyano-2-(3,4-dihydroxy-5-nitrophenyl)vinyl)thiazole-4-carboxylic
acid (4)
A solution of 2-(cyanomethyl)thiazole-4-carboxylic acid (168 mg,
1.0 mmol), 3,4-dihydroxy-5-nitrobenzaldehyde (183 mg, 1.0 mmol) and
NH.sub.4OAc (554 mg, 7.2 mmol) in MeOH (15 mL) was heated to reflux
for 3 hours, then cooled to room temperature. The solid was
filtered and washed by H.sub.2O (15 mL), The solid was re-dissolved
in MeOH (5 mL). 5 mL of 1N aqueous HCl was added to adjust pH 3-4.
The desired product was obtained by filter and dried in vacuo as
bright solid (150 mg, 45%). .sup.1H NMR (400 MHz, DMSO) .delta.
7.98 (s, 1H), 7.91 (s, 1H), 7.84 (s, 1H), 7.15-7.75 (m, 4H). MS
[MH].sup.+ calcd for C.sub.13H.sub.7N.sub.3O.sub.6S 334.0, found
334.0.
Compound 668:
668 was prepared in three synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00176##
Step 1: Synthesis of 2-cyano-N-(1,2,4-thiadiazol-5-yl)acetamide
(2)
Under a nitrogen atmosphere, NaH (200 mg, 5 mmol, 60%) was added to
a suspension of 1,2,4-thiadiazol-5-amine (500 mg, 5 mmol) in THF
(25 mL) at 0.degree. C. The resulting suspension was stirred at
0.degree. C. for 15 min and the solution of 2-cyanoacetyl chloride
(500 mg, 5 mmol) in THF was added over 10 min and stirred for an
additional 1 h at RT, then quenched by the addition of 1N.HCl
solution and stirred for 10 min at room temperature. Extracted it
by ethyl acetate (25 mL.times.2), and the organic layers was dried
with Na.sub.2SO.sub.4 and concentrated in vacuo to give the crude
product. Washed it by PE/EA=1:1 (5 mL) to afford the purity product
(260 mg, 30%). MS [MH].sup.+ calcd for C.sub.5H.sub.4N.sub.4OS
169.0, found 169.0.
Step 2: Synthesis of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-(1,2,4-thiadiazol-5-y-
l)acrylamide (3)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. When the reaction was complete, the
organic solvent was eliminated by distillation under reduced
pressure. Additional toluene was added and eliminated again. The
resulting yellowish solid 3,4-dimethoxy-5-nitrobenzoyl chloride was
dissolved in anhydrous THF (5 mL)
Under a nitrogen atmosphere, 60% NaH (80 mg, 2.0 mmol) was added to
solution of 2-cyano-N-(1,2,4-thiadiazol-5-yl)acetamide (250 mg, 1.5
mmol) in anhydrous THF (10 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the THF
solution of 3,4-dimethoxy-5-nitrobenzoyl chloride was added over 10
min and stirred for an additional 1 hour at -5.degree. C. The
reaction mixture was warmed to 0.degree. C.; quenched by the
addition of 1N.HCl solution (4 mL) and stirred for 10 min at room
temperature. Extracted by ethyl acetate (25 mL.times.2), the
organic layers was dried with Na.sub.2SO.sub.4 and concentrated in
vacuo to give the title compound as orange solid (210 mg, 37%). MS
[M+H].sup.+ calcd for C.sub.14H.sub.11N.sub.5O.sub.6S 378.0, found
378.0.
Step 3: Synthesis of
2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-N-(1,2,4-thiadiazol-5-y-
l)acrylamide (4)
A solution of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-(1,2,4-thiadiazol-5-y-
l)acrylamide (150 mg, 0.40 mmol) in DCM (5 mL) was added 1.0 M
solution of BBr.sub.3 in DCM (2 mL, 2 mmol) at -15.degree. C. under
a nitrogen atmosphere. The suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL.times.3). The organic layers were combined, washed
with brine and dried with Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Further purification by Prep-HPLC (0.5% TFA, MeOH/H.sub.2O) gave
the desired product as bright yellow solid (50 mg, 36%).'H NMR (400
MHz, DMSO) .delta. 13.80 (s, 1H), 8.33 (s, 1H), 7.72 (d, J=1.8 Hz,
1H), 7.47 (d, J=1.8 Hz, 1H). MS [MH].sup.+ calcd for
C.sub.12H.sub.7N.sub.5O.sub.6S 350.0, found 350.0.
Compound 673:
673 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00177##
Step 1: Synthesis of
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-(pyrimidin-4-ylme-
thyl)acrylamide (2)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 2-cyano-N-(pyrimidin-4-ylmethyl)acetamide (0.35
g, 2.0 mmol) in anhydrous THF (5 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10
min and stirred for an additional 1 hour at -5.degree. C. The
reaction mixture was warmed to 0.degree. C., quenched by the
addition of 1N.HCl solution (4 mL) and stirred for 10 min at room
temperature, extracted by ethyl acetate (25 mL*2), the organic
layers was dried with Na.sub.2SO.sub.4 and concentrated in vacuo to
give the title compound 3 as an orange solid (169 mg, 22%). MS
[M+H].sup.+ calcd for C.sub.17H.sub.16N.sub.5O.sub.6 386.1, found
386.0.
Step 2: Synthesis of
(Z)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-N-(pyrimidin-4-ylme-
thyl)acrylamide (3)
A solution of
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-(pyrimidin-4-ylme-
thyl)acrylamide (115 mg, 0.3 mmol) in DCM (5 mL) was added 1.0 M
solution of BBr.sub.3 in DCM (3 mL, 3 mmol) at -15.degree. C. under
nitrogen atmosphere. The resulting red suspension was stirred for 1
hour at -15.degree. C. and allowed to warm to room temperature
overnight. The reaction was quenched by the addition of H.sub.2O (2
mL) and stirred for 30 min. The aqueous phase was extracted with
ethyl acetate (30 mL.times.3). The organic layers were combined,
washed with brine and dried with Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Further purification by Prep-HPLC (0.5% TFA, MeOH/H.sub.2O) gave
the desired product as yellow solid (8 mg, 7%). 1H NMR (400 MHz,
DMSO) .delta. 14.18 (s, 1H), 10.74 (s, 2H), 9.12 (s, 1H), 8.75 (d,
J=5.2 Hz, 1H), 7.88 (s, 1H), 7.55 (d, J=2.1 Hz, 1H), 7.45 (d, J=4.7
Hz, 1H), 4.52 (s, 2H). MS [M+H].sup.+ calcd for
C.sub.15H.sub.12N.sub.5O.sub.6 356.1, found 356.0
Compound 675:
675 was prepared by four synthetic steps from methyl
3-hydroxyisoxazole-5-carboxylate according to the following
procedure:
##STR00178##
Step 1: Synthesis of methyl 3-methoxyisoxazole-5-carboxylate
(2)
A mixture of methyl 3-hydroxyisoxazole-5-carboxylate (1.0 g, 7.0
mmol) and K.sub.2CO.sub.3 (1.9 g, 14 mmol) in dry DMF (15 mL) was
added Me.sub.2SO.sub.4 (1.0 g, 8.4 mmol) at 0.degree. C. The
reaction solution was stirred at 0.degree. C. continuously, and
monitored by TLC until all the starting material was consumed
completely; 50 mL of water was added. The residue was extracted by
EA for two times (25 mL.times.2), and the organic layer was washed
with brine (25 mL.times.3), and dried over anhydrous
Na.sub.2SO.sub.4. The organic layer was concentrated in vacuo to
afford the desired product (850 mg, 77%) without further
purification. MS [M+H].sup.+ calcd for C.sub.6H.sub.7NO.sub.4
158.0, found 158.0.
Step 2: Synthesis of3-(3-methoxyisoxazol-5-yl)-3-oxopropanenitrile
(3)
A mixture of MeCN (553 mg, 13.5 mmol) and t-BuOK (1.5 g, 13.5 mmol)
in dry THF (25 mL) and toluene (15 mL) was added methyl
3-methoxyisoxazole-5-carboxylate (850 mg, 5.4 mmol) at rt. The
reaction solution was stirred at 80.degree. C. continuously for 24
h, and monitored by TLC until all the starting material was
consumed completely. 50 mL of water was added. The aqueous phase
was extracted by EA for two times (25 mL.times.2), and the organic
layer was combined and washed with brine (25 mL.times.3), and dried
over anhydrous Na.sub.2SO.sub.4. The organic layer was concentrated
in vacuo to afford the crude product which was purified by silica
chromatograph (100 g, 200-300 m, eluted by PE/EA=3/1) to afford the
desired product as bright yellow solid (650 mg, 72%). MS
[M+H].sup.+ calcd for C.sub.7H.sub.6N.sub.2O.sub.3167.0, found
167.0.
Step 3: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(3-methoxyisoxazole-5-carbonyl)acry-
lonitrile (5)
A mixture of 3-(3-methoxyisoxazol-5-yl)-3-oxopropanenitrile (200
mg, 1.2 mmol), 3,4-dihydroxy-5-nitrobenzaldehyde (183 mg, 1.0 mmol)
and NH.sub.4OAc (554 mg, 7.2 mmol) in MeOH (15 mL) was refluxed for
3 hours, then cooled to room temperature. The reaction mixture was
filtered and the solid was collected and washed by H.sub.2O (15
mL). The solid was re-dissolved in MeOH (5 mL) and the PH was
adjusted to 3-5 by adding 5 mL of 1N aqueous HCl. The desired
product was obtained by filter and dried in vacuo as bright yellow
solid (250 mg, 76%). MS [MH].sup.+ calcd for
C.sub.14H.sub.9N.sub.3O.sub.7 332.0, found 332.0.
Step 4: Synthesis of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(3-hydroxyisoxazole-5-carbonyl)acry-
lonitrile (6)
A solution of
(E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(3-methoxyisoxazole-5-carbonyl)
acrylonitrile (150 mg, 0.45 mmol) in AcOH (5 mL) was added 0.5 mL
33% HBr (in AcOH) at rt. The reaction solution was stirred at
80.degree. C. continuously for 3 h and monitored by LC-MS until all
the starting material was consumed completely. The reaction mixture
was concentrated in vacuo to afford the crude product which was
purified by by Prep-HPLC (0.5% TFA, MeCN/H.sub.2O) to afford the
desired product as yellow solid (22 mg, 15%). MS [MH].sup.+ calcd
for C.sub.13H.sub.7N.sub.3O.sub.7 318.0, found 318.0. .sup.1H NMR
(400 MHz, DMSO) .delta. 11.96 (s, 2H), 8.32 (s, 1H), 8.18 (d, J=2.1
Hz, 1H), 7.88 (d, J=2.2 Hz, 1H), 6.93 (s, 1H)
Compound 687:
687 was prepared in two synthetic steps from 2-cyanoacetate
according, according to the following procedure:
##STR00179##
Step 1: Synthesis of 3-(azetidin-1-yl)-3-oxopropanenitrile (2)
A mixture of ethyl 2-cyanoacetate (565 mg, 5.0 mmol) and azetidine
(285 mg, 5.0 mmol) was stirred at rt overnight. The reaction
solution was purified by HPLC to afford the desire product. MS
[MH+H].sup.+ calcd for C.sub.6H.sub.9N.sub.2O.sub.1 125.1, found
125.1
Step 2: Synthesis of 3-(azetidin-1-yl)-3-oxopropanenitrile (3)
A mixture of 3-(azetidin-1-yl)-3-oxopropanenitrile (124 mg, 1.0
mmol), 3,4-dihydroxy-5-nitrobenzaldehyde (183 mg, 1.0 mmol) and
CH.sub.3COONH.sub.4 (770 mg, 10.0 mmol) in MeOH (15 mL) was stirred
at 80.degree. C. overnight and then cooled to rt. The reaction
mixture was filtered to collect the solid. The solid was
re-dissolved in MeOH and the PH was adjusted to 3-5 by adding 1N
HCl. The desire product was collected by filtered and dried in
vavuo. (116 mg, 40%). MS [M+H].sup.+ calcd for
C.sub.13H.sub.12N.sub.3O.sub.5 290.2, found 289.9. .sup.1H NMR (400
MHz, DMSO) .delta. 10.93 (s, 2H), 8.01 (d, J=2.1 Hz, 1H), 7.97 (s,
1H), 7.81 (d, J=2.1 Hz, 1H), 4.48 (t, J=7.2 Hz, 2H), 4.03 (t, J=7.3
Hz, 2H), 2.32-2.22 (m, 2H).
Compound 688:
688 was prepared in two synthetic steps from 2-cyanoacetate
according to the following procedure:
##STR00180##
Step 1: Synthesis of 2-cyano-N-(2-hydroxyethyl)acetamide (2)
A mixture of ethyl 2-cyanoacetate (113 mg, 1.0 mmol) and
2-aminoethanol (305 mg, 5.0 mmol) was stirred at rt overnight. The
reaction solution was purified by HPLC to afford the desire
product. MS [M+H].sup.+ calcd for C.sub.5H.sub.9N.sub.2O.sub.2
129.1, found 129.1
Step 2: Synthesis of
(E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-(2-hydroxyethyl)acrylamide
(3)
A mixture of 2-cyano-N-(2-hydroxyethyl)acetamide (65 mg, 0.5 mmol),
3,4-dihydroxy-5-nitrobenzaldehyde (92 mg, 0.5 mmol) in MeOH (15 mL)
and CH.sub.3COONH.sub.4 (385 mg, 5.0 mmol) was stirred at
80.degree. C. overnight and then cooled to rt. The reaction mixture
was filtered to collect the solid. The solid was re-dissolved in
MeOH and the PH was adjusted to 3-5 by adding 1N HCl. The desire
product was collected by filtered and dried in vavuo. (80 mg, 54%).
MS [M+H].sup.+ calcd for C.sub.13H.sub.12N.sub.3O.sub.6 294.2,
found 293.8. .sup.1H NMR (400 MHz, DMSO) .delta. 10.92 (s, 2H),
8.30 (t, J=5.5 Hz, 1H), 8.06 (s, 1H), 7.95 (d, J=2.1 Hz, 1H), 7.78
(d, J=2.2 Hz, 1H), 3.49 (t, J=6.1 Hz, 2H), 3.28 (q, J=5.9 Hz, 2H),
3.17 (s, 1H).
Compound 691:
691 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00181##
Step 1: Synthesis of
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-ethylacrylamide
(3)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 2-cyano-N-ethylacetamide (0.23 g, 2.0 mmol) in
anhydrous THF (5 mL) at -5.degree. C. The resulting suspension was
stirred at -5.degree. C. for 15 min and the solution of
3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10 min
and stirred for an additional 1 h at -5.degree. C. The reaction
mixture was warmed to 0.degree. C., quenched by the addition of
1N.HCl solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL*2), the organic layers was dried
with Na.sub.2SO.sub.4 and concentrated in vacuo to give the title
compound 3 as an yellow solid (288 mg, 39%).
Step 2: Synthesis of
(Z)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-ethyl-3-hydroxyacrylamide
(4)
A solution of
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-ethylacrylamide
(167 mg, 0.5 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (3 mL, 3 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL*3). The organic layers were combined, washed with
brine and dried with Na.sub.2SO.sub.4. The solvent was eliminated
under reduced pressure to give the crude product. Further
purification by Prep-HPLC gave the desired product as yellow solid
(48 mg, 33%). 1H NMR (400 MHz, DMSO) .delta. 14.18 (s, 1H), 10.74
(s, 2H), 9.12 (s, 1H), 8.75 (d, J=5.2 Hz, 1H), 7.88 (s, 1H), 7.55
(d, J=2.1 Hz, 1H), 7.45 (d, J=4.7 Hz, 1H), 4.52 (s, 2H). MS
[M+H].sup.+ calcd for C.sub.12H.sub.12N.sub.3O.sub.6 294.2, found
293.8
Compound 692:
692 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00182##
Step 1: Synthesis of
(Z)-2-cyano-N-cyclopropyl-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxyacryla-
mide (3)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 2-cyano-N-cyclopropylacetamide (250 mg, 2.0
mmol) in anhydrous THF (5 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10
min and stirred for an additional 1 h at -5.degree. C. The reaction
mixture was warmed to 0.degree. C., quenched by the addition of
1N.HCl solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL*2), the organic layers was dried
with Na.sub.2SO.sub.4 and concentrated in vacuo to give the
compound 3 as an yellow solid (242 mg, 36%).
Step 2: Synthesis of
(Z)-2-cyano-N-cyclopropyl-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxyacryla-
mide (4)
A solution of
(Z)-2-cyano-N-cyclopropyl-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxyacryla-
mide (166 mg, 0.5 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (3 mL, 3 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL*3). The organic layers were combined, washed with
brine and dried with Na.sub.2SO.sub.4. The solvent was eliminated
under reduced pressure to give the crude product. Further
purification by Prep-HPLC gave the desired product as yellow solid
(25 mg, 26%). 1H NMR (400 MHz, DMSO) .delta. 10.81 (s, 1H), 8.82
(s, 1H), 7.88 (d, J=1.9 Hz, 1H), 7.54 (d, J=2.1 Hz, 1H), 2.83-2.77
(m, 1H), 0.74-0.64 (m, 4H). MS [M-H].sup.- calcd for
C.sub.13H.sub.10N.sub.3O.sub.6 304.2, found 303.9.
Compound 697:
697 was prepared in two synthetic steps from methyl
5-(cyanomethyl)pyrazine-2-carboxylate, according to the following
procedure:
##STR00183##
Step 1: Synthesis of (E)-methyl
5-(1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)-2-hydroxyvinyl)pyrazine-2-carb-
oxylate (3)
Under a nitrogen atmosphere, 60% NaH (0.072 g, 1.8 mmol) was added
to the solution of methyl 5-(cyanomethyl)pyrazine-2-carboxylate
(0.15 g, 0.9 mmol) in anhydrous THF (5 mL) at -5.degree. C. The
resulting suspension was stirred at -5.degree. C. for 15 min and
the solution of 3,4-dimethoxy-5-nitrobenzoyl chloride in THF was
added over 10 min and stirred for an additional 1 hour at
-5.degree. C. The reaction mixture was warmed to 0.degree. C.,
quenched by the addition of 1N.HCl solution (4 mL) and stirred for
10 min at room temperature, extracted by ethyl acetate (25 mL*2),
the organic layers was dried with Na.sub.2SO.sub.4 and concentrated
in vacuo to give the title compound (E)-methyl
5-(1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)-2-hydroxyvinyl)pyrazine-2-carb-
oxylate as an orange solid(125 mg, 30%). MS [M+H].sup.+ calcd for
C.sub.17H.sub.14N.sub.4O.sub.7 387.0, found 387.0.
Step 2: Synthesis of
(E)-5-(1-cyano-2-(3,4-dihydroxy-5-nitrophenyl)-2-hydroxyvinyl)
pyrazine-2-carboxylic acid (4)
A solution of (E)-methyl
5-(1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)-2-hydroxyvinyl)
pyrazine-2-carboxylate (125 mg, 0.3 mmol) in DCM (5 mL) was added
1.0 M solution of BBr.sub.3 in DCM (3 mL, 3 mmol) at -15.degree. C.
under nitrogen atmosphere. The resulting red suspension was stirred
for 1 hour at -15.degree. C. and allowed to warm to room
temperature overnight. The reaction was quenched by the addition of
H.sub.2O (2 mL) and stirred for 30 min. The aqueous phase was
extracted with ethyl acetate (30 mL*3). The organic layers were
combined, washed with brine and dried with Na.sub.2SO.sub.4. The
solvent was eliminated under reduced pressure to give the crude
product. Further purification by Prep-HPLC (0.5% TFA,
MeOH/H.sub.2O) gave the desired product as yellow solid (15 mg,
15%). 1H NMR (400 MHz, DMSO) .delta. 10.57 (s, 1H), 9.17 (s,
1H),8.68 (s, 1H), 7.81 (s, 1H), 7.51 (s, 1H). MS [M+H].sup.+ calcd
for C.sub.14H.sub.8N.sub.4O.sub.7 345.0, found 345.0
Compound 701:
701 was prepared in two synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00184##
Step 1: Synthesis of
(Z)-2-(azetidine-1-carbonyl)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxyacr-
ylonitrile (3)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 2-cyano-N-cyclopropylacetamide (250 mg, 2.0
mmol) in anhydrous THF (5 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10
min and stirred for an additional 1 h at -5.degree. C. The reaction
mixture was warmed to 0.degree. C., quenched by the addition of
1N.HCl solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL*2), the organic layers was dried
with Na.sub.2SO.sub.4 and concentrated in vacuo to give the
compound 3 (146 mg, 22%).
Step 2: Synthesis of
(Z)-2-(azetidine-1-carbonyl)-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxyacr-
ylonitrile (4)
A solution of
(Z)-2-(azetidine-1-carbonyl)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxyacr-
ylonitrile (146 mg, 0.4 mmol) in DCM (5 mL) was added 1.0 M
solution of BBr.sub.3 in DCM (2 mL, 2 mmol) at -15.degree. C. under
nitrogen atmosphere. The resulting red suspension was stirred for 1
hour at -15.degree. C. and allowed to warm to room temperature
overnight. The reaction was quenched by the addition of H.sub.2O (2
mL) and stirred for 30 min. The aqueous phase was extracted with
ethyl acetate (30 mL*3). The organic layers were combined, washed
with brine and dried with Na2SO4. The solvent was eliminated under
reduced pressure to give the crude product. Further purification by
Prep-HPLC gave the desired product (18 mg, 15%). 11H NMR (400 MHz,
DMSO) .delta. 10.93 (s, 2H), 7.93 (d, J=2.1 Hz, 1H), 7.55 (d, J=2.1
Hz, 1H), 4.36 (s, 4H), 2.35-2.27 (m, 2H). MS [M+H]+ calcd for
C13H12N306 306.2, found 305.9
Compound 711:
711 was prepared in two synthetic steps from
3-oxo-3-(thiazol-4-yl)propanenitrile, according to the following
procedure:
##STR00185##
Step 1: Synthesis of
(Z)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(thiazole-4-carbonyl)acry-
lonitrile (2)
Under a nitrogen atmosphere, 60% NaH (0.072 g, 1.8 mmol) was added
to the solution of 3-oxo-3-(thiazol-4-yl)propanenitrile (0.41 g,
2.7 mmol) in anhydrous THF (15 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride (661 mg, 2.7 mmol) in THF
was added over 5 min and stirred for an additional 1 hour at
-5.degree. C. The reaction mixture was warmed to 0.degree. C.,
quenched by the addition of 1N.HCl solution (4 mL) and stirred for
10 min at room temperature, extracted by ethyl acetate (25 mL*2),
the organic layers was dried with Na.sub.2SO.sub.4 and concentrated
in vacuo to give the title compound (E)-methyl
5-(1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)-2-hydroxyvinyl)pyrazine-2-carb-
oxylate as an orange solid (600 mg, 62%). MS [M+H]+ calcd for
C.sub.15H.sub.11N.sub.3O.sub.6S 362.0, found 362.0.
Step 2: Synthesis of
(Z)-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-2-(thiazole-4-carbonyl)acry-
lonitrile (4)
A solution of
(Z)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(thiazole-4-carbonyl)acry-
lonitrile (70 mg, 0.2 mmol) in DCM (5 mL) was added 1.0 M solution
of BBr.sub.3 in DCM (1 mL, 1 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of 0.5 N.NH.sub.4OH (2
mL) and stirred for 30 min. The aqueous phase was extracted with
ethyl acetate (30 mL*3). The organic layers were combined, washed
with brine and dried with Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Further purification by Prep-HPLC (0.5% TFA, MeOH/H.sub.2O) gave
the desired product as yellow solid (11 mg, 17%). 1H NMR (400 MHz,
DMSO) .delta. 10.66 (s, 1H), 8.61 (s,1H), 7.97 (s, 1H), 7.65 (s,
1H). MS [M+H].sup.+ calcd for C.sub.13H.sub.7N.sub.3O.sub.6S 334.0,
found 334.0.
Compound 709:
709 was prepared in two synthetic steps from
(E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylic acid, according
to the following procedure:
##STR00186##
Step 1: Synthesis of (E)-methyl
2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)acetate
(2)
A solution of (E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylic
acid (1) (250 mg, 1 mmol) and methyl 2-aminoacetate (89 mg, 1 mmol)
in THF (15 mL) was added HBTU (600 mg, 1.5 mmol) and DIPEA (388 mg,
3 mmol) at rt. The resulting suspension was stirred for 5 hours at
60.degree. C. and allowed to cool to room temperature overnight.
The reaction was added H.sub.2O and extracted with ethyl acetate
(30 mL*3). The organic layers were combined to afford the crude
product which was used in the next step without further
purification (120 mg, 37.4%).
Step 2: Synthesis of
(E)-2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)acetic
acid (3)
A solution of (E)-methyl
2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)acetate (2)
(120 mg, 0.37 mmol) in THF/H.sub.2O (5 mL/5 mL) was added LiOH (24
mg, 0.55 mmol) at 0.degree. C. The resulting suspension was stirred
for 1 hour at 0.degree. C. and was quenched by adding aqueous HCl.
The aqueous phase was extracted with ethyl acetate (30 mL*3). The
organic layers were combined, washed with brine and dried with
Na.sub.2SO.sub.4. The solvent was eliminated under reduced pressure
to give the crude product. Further purification by Prep-HPLC gave
the desired product (7 mg, 6.2%). 1H NMR (400 MHz, DMSO) .delta.
8.65 (t, J=5.8 Hz, 1H), 8.10 (s, 1H), 7.98 (d, J=2.1 Hz, 1H), 7.79
(d, J=2.1 Hz, 1H), 3.88 (d, J=5.8 Hz, 2H). MS [M+H].sup.+ calcd for
C.sub.12H.sub.10N.sub.3O.sub.7 308.2, found 308.0.
Compound 693:
693 was prepared in three synthetic steps from ethyl
2-cyanoacetate, according to the following procedure:
##STR00187##
Step 1: Synthesis of (S)-methyl
2-(2-cyanoacetamido)-3-hydroxypropanoate (2)
A mixture of ethyl 2-cyanoacetate (1130 mg, 10.0 mmol) and
(S)-methyl 2-amino-3-hydroxypropanoate (1190 mg, 10.0 mmol) was
stirred at r.t. overnight. The reaction solution was added 10 mL
MeOH and filtered to collect the solid as crude product, which was
used in next step without further purification. MS [M+H].sup..+-.
calcd for C.sub.7H.sub.11N.sub.2O.sub.4 187.2, found 187.2.
Step 2: Synthesis of (S,E)-methyl
2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)-3-hydroxypropanoate
(3)
A solution of (S)-methyl 2-(2-cyanoacetamido)-3-hydroxypropanoate
(930 mg, 5 mmol) (2) and 3,4-dihydroxy-5-nitrobenzaldehyde (915 mg,
5 mmol) in MeOH (25 mL) was added CH.sub.3COONH.sub.4 (3850 mg, 50
mmol) at rt. The reaction solution was stirred at 60.degree. C.
continuously for 5h and monitored by TLC until all the starting
material was consumed completely. Then the reaction mixture was
cooled to rt and the solvent was eliminated under reduced pressure,
then the Sat. aq. NaCl (100 mL) was added. The aqueous solution was
extracted by EA for three times (50 mL*3). The organic layer was
concentrated in vacuo to afford crude product which was purified by
silica chromatograph chromatography to afford the desired product
(705 mg, 40%). MS [M+H].sup.+ calcd for
C.sub.14H.sub.14N.sub.3O.sub.8 352.3, found 352.3.
Step 3: Synthesis of
(S,E)-2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)-3-hydroxyprop-
anoic acid (4)
A solution of (S,E)-methyl
2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)-3-hydroxypropanoate
(3) (705 mg, 2 mmol) in THF/H.sub.2O (10 mL/10 mL) was added LiOH
(126 mg, 3 mmol) at 0.degree. C. The resulting suspension was
stirred for 1 hour at 0.degree. C. and was quenched by adding
aqueous HCl. The aqueous phase was extracted with ethyl acetate (30
mL*3). The organic layers were combined, washed with brine and
dried with Na.sub.2SO.sub.4. The solvent was eliminated under
reduced pressure to give the crude product. Further purification by
Prep-HPLC gave the desired product (220 mg, 32.6%). 1H NMR (400
MHz, DMSO) .delta. 12.89 (s, 1H), 10.94 (s, 2H), 8.22 (d, J=7.6 Hz,
1H), 8.15 (s, 1H), 7.97 (d, J=2.1 Hz, 1H), 7.82 (d, J=2.1 Hz, 1H),
5.05 (s, 1H), 4.41 (m, 1H), 3.79 (m, 2H). MS [M+H].sup.+ calcd for
C.sub.13H.sub.12N.sub.3O.sub.8 338.2, found 337.8
Compound 702:
702 was prepared in three synthetic steps from ethyl
2-cyanoacetate, according to the following procedure:
##STR00188##
Step 1: Synthesis of (S)-methyl
1-(2-cyanoacetyl)pyrrolidine-2-carboxylate (2)
A mixture of ethyl 2-cyanoacetate (113 mg, 1.0 mmol) and (S)-methyl
pyrrolidine-2-carboxylate (129 mg, 1.0 mmol) was stirred at r.t.
overnight. The reaction solution was added 10 mL MeOH and filtered
to collect the solid as crude product, which was used in next step
without further purification. MS [M+H].sup.+ calcd for
C.sub.9H.sub.13N.sub.2O.sub.3197.2, found 197.2.
Step 2: Synthesis of (S,E)-methyl
2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)-3-hydroxypropanoate
(3)
A solution of (S)-methyl 1-(2-cyanoacetyl)pyrrolidine-2-carboxylate
(2) (196 mg, 1 mg) and 3,4-dihydroxy-5-nitrobenzaldehyde (183 mg, 1
mmol) in MeOH (5 mL) was added CH.sub.3COONH.sub.4 (770 mg, 10
mmol) at rt. The reaction solution was stirred at 60.degree. C.
overnight and monitored by TLC until all the starting material was
consumed completely. Then the reaction mixture was cooled to r.t.
and the solvent was eliminated under reduced pressure, then the
Sat. aq. NaCl (100 mL) was added. The aqueous solution was
extracted by EA for three times (50 mL*3). The organic layer was
concentrated in vacuo to afford crude product which was purified by
silica chromatograph chromatography to afford the desired product
(43 mg, 12%). MS [M+H].sup.+ calcd for
C.sub.16H.sub.16N.sub.3O.sub.7362.3, found 362.3.
Step 3: Synthesis of
(S,E)-1-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acryloyl)pyrrolidine-2-ca-
rboxylic acid (4)
A solution of (S,E)-methyl
2-(2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamido)-3-hydroxypropanoate
(3) (43 mg, 0.12 mmol) in THF/H.sub.2O (2 mL/1 mL) was added LiOH
(8 mg, 0.18 mmol) at 0.degree. C. The resulting suspension was
stirred for 1 hour at 0.degree. C. and was quenched by adding
aqueous HCl. The aqueous phase was extracted with ethyl acetate (30
mL*3). The organic layers were combined, washed with brine and
dried with Na.sub.2SO.sub.4. The solvent was eliminated under
reduced pressure to give the crude product. Further purification by
Prep-HPLC gave the desired product (6 mg, 15%). 1H NMR (400 MHz,
DMSO) .delta. 7.25 (t, J=7.4 Hz, 1H), 7.21-7.09 (m, 2H), 2.30 (s,
2H), 2.07 (s, 4H). MS [M+H].sup.+ calcd for
C.sub.15H.sub.14N.sub.3O.sub.7 348.3, found 347.8
Compound 347N:
347N was prepared in single synthetic step from
2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl-3-oxopropanamide
(1, compound 347), according to the following procedure:
##STR00189##
Step 1: Synthesis of
2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl-3-hydroxyacrylamide
(2)
A solution of
2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl-3-oxopropanamide
(350 mg, 1 mmol) in DCM (5 mL) was added HMDS (0.5 mL) at rt, then
stirred for 48 h. After the reaction was completed, the reaction
mixture was concentrated in vacuo to afford the crude product,
further purification by Prep-HPLC afforded the desired product as
yellow solid (60 mg, 19%). MS [M+H].sup.+ calcd for
C.sub.14H.sub.16N.sub.4O.sub.5 321.1, found 321.1.
Compound 661N:
661N was prepared in one synthetic step from
(Z)-3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-2-(piperidine-1-carbonyl)ac-
rylonitrile, according to the following procedure:
##STR00190##
Step 1: Synthesis of
3-amino-3-(3,4-dihydroxy-5-nitrophenyl)-2-(piperidine-1-carbonyl)acryloni-
trile (2)
A solution of
3-(3,4-dihydroxy-5-nitrophenyl)-3-hydroxy-2-(piperidine-1-carbonyl)acrylo-
nitrile (20 mg, 0.06 mmol) in DCM (5 mL) was added HMDS (1 mL) and
stirred at rt for 72 h. And then the reaction mixture was
concentrated in vacuo to afford the crude product, which was
further purified by HPLC to afford the desired product as a yellow
solid (1 mg, 5%). MS [MH]+ calcd for C.sub.15H.sub.16N.sub.4O.sub.5
333.3, found 333.1. 1H NMR (400 MHz, DMSO) .delta. 8.21 (s, 1H),
7.66 (s,1H), 6.74 (s, 1H), 1.25-1.65 (m, 6H), 1.23 (s, 1H).
Compound 691N:
691N was prepared in four synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00191##
Step 1: Synthesis of
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-ethylacrylamide
(3)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 2-cyano-N-ethylacetamide (0.23 g, 2.0 mmol) in
anhydrous THF (5 mL) at -5.degree. C. The resulting suspension was
stirred at -5.degree. C. for 15 min and the solution of
3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10 min
and stirred for an additional 1 hour at -5.degree. C. The reaction
mixture was warmed to 0.degree. C., quenched by the addition of
1N.HCl solution (4 mL) and stirred for 10 min at room temperature,
extracted by ethyl acetate (25 mL*2), the organic layers was dried
with Na.sub.2SO.sub.4 and concentrated in vacuo to give the title
compound 3 as an yellow solid (265 mg, 36%).
Step 2: Synthesis of
(Z)-3-chloro-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N-ethylacrylamide
(4)
A solution of
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-ethylacrylamide
(176 mg, 0.5 mmol) in DCM (5 mL) was added PCl.sub.5 (104 mg, 0.5
mmol) at 0.degree. C. The resulting suspension was stirred at
overnight until all the start materials were consumed detected by
LC-MS. Then the reaction mixture was allowed to cool to room
temperature and used in the next step without further
purification.
Step 3: Synthesis of
(Z)-3-amino-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N-ethylacrylamide
(5)
A solution of
(Z)-3-chloro-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N-ethylacrylamide
(150 mg, 0.4 mmol) in DCM was added a saturated solution of
NH.sub.3 in ACN at 0.degree. C., and then the reaction solution was
stirred at 0.degree. C. continuously until all the starting
materials were consumed completely. The reaction was quenched by
the addition of H.sub.2O and stirred for 30 min. The aqueous phase
was extracted with ethyl acetate. The organic layers were combined,
washed with brine and dried with Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product.
Step 4: Synthesis of
(Z)-3-amino-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-ethylacrylamide
(6)
A solution of
(Z)-3-amino-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N-ethylacrylamide
(67 mg, 0.2 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (1 mL, 1 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL*3). The organic layers were combined, washed with
brine and dried with Na.sub.2SO.sub.4. The solvent was eliminated
under reduced pressure to give the crude product. Further
purification by Prep-HPLC gave the desired product as yellow solid
(5 mg, 9%). 1H NMR (400 MHz, DMSO) .delta. 10.53 (s, 2H), 9.44 (s,
1H), 8.02 (s, 2H), 7.63 (d, J=2.0 Hz, 1H), 7.36 (d, J=2.0 Hz, 1H),
3.32-3.25 (m, 2H), 1.14 (t, J=7.1 Hz, 3H). MS [M+H].sup.+ calcd for
C.sub.12H.sub.13N.sub.4O.sub.5 293.2, found 292.8.
Compound 692N:
692N was prepared in four synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00192##
Step 1: Synthesis of
(Z)-2-cyano-N-(cyclopropylmethyl)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydro-
xyacrylamide (3)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 2-cyano-N-cyclopropylacetamide (250 mg, 2.0
mmol) in anhydrous THF (5 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10
min and stirred for an additional 1 hour at -5.degree. C. The
reaction mixture was warmed to 0.degree. C., quenched by the
addition of 1N.HCl solution (4 mL) and stirred for 10 min at room
temperature, extracted by ethyl acetate (25 mL*2), the organic
layers was dried with Na.sub.2SO.sub.4 and concentrated in vacuo to
give the title compound 3 as an yellow solid(165 mg, 23%).
Step 2: Synthesis of
(Z)-3-chloro-2-cyano-N-(cyclopropylmethyl)-3-(3,4-dimethoxy-5-nitrophenyl-
)acrylamide (4)
A solution of
(Z)-2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-N-propylacrylamide
(165 mg, 0.5 mmol) in DCM (5 mL) was added PCl.sub.5 (104 mg, 0.5
mmol) at 0.degree. C. The resulting suspension was stirred at
overnight until all the start materials were consumed detected by
LC-MS. Then the reaction mixture was allowed to cool to room
temperature and used in the next step without further
purification.
Step 3: Synthesis of
(Z)-3-amino-2-cyano-N-cyclopropyl-3-(3,4-dimethoxy-5-nitrophenyl)acrylami-
de (5)
A solution of
(Z)-3-chloro-2-cyano-N-(cyclopropylmethyl)-3-(3,4-dimethoxy-5-nitrophenyl-
)acrylamide (164 mg, 0.5 mmol) in DCM was added a saturated
solution of NH.sub.3 in ACN at 0.degree. C., and then the reaction
solution was stirred at 0.degree. C. continuously until all the
starting materials were consumed completely. The reaction was
quenched by the addition of H.sub.2O and stirred for 30 min. The
aqueous phase was extracted with ethyl acetate. The organic layers
were combined, washed with brine and dried with Na.sub.2SO.sub.4.
The solvent was eliminated under reduced pressure to give the crude
product which was used in the next step without further
purification.
Step 4: Synthesis of
(Z)-3-amino-2-cyano-N-cyclopropyl-3-(3,4-dihydroxy-5-nitrophenyl)acrylami-
de (6)
A solution of
(Z)-3-amino-2-cyano-N-cyclopropyl-3-(3,4-dimethoxy-5-nitrophenyl)acrylami-
de (66 mg, 0.2 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (1 mL, 1 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL*3). The organic layers were combined, washed with
brine and dried with Na.sub.2SO.sub.4. The solvent was eliminated
under reduced pressure to give the crude product. Further
purification by Prep-HPLC gave the desired product. (7 mg, 12%). 1H
NMR (400 MHz, DMSO) .delta. 10.52 (s, 2H), 9.53 (s, 1H), 7.63 (d,
J=2.0 Hz, 1H), 7.35 (d, J=2.0 Hz, 1H), 2.61-2.55 (m, 1H), 0.86-0.81
(m, 2H), 0.66-0.61 (m, 2H). MS [M+H].sup.+ calcd for
C.sub.13H.sub.13N.sub.4O.sub.5 305.3, found 304.9
Compound 697N:
697N was prepared in two synthetic steps from (E)-methyl
5-(1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)-2-hydroxyvinyl)pyrazine-2-carb-
oxylate, according to the following procedure:
##STR00193##
Step 1: Synthesis of (E)-methyl
5-(2-chloro-1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)vinyl)pyrazine-2-carbo-
xylate (2)
A solution of (E)-methyl
5-(1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)-2-hydroxyvinyl)
pyrazine-2-carboxylate (150 mg, 0.39 mmol) in 1,2-dichloroethane
(25 mL) was added PCl.sub.5 (83 mg, 0.40 mmol) at 0.degree. C. The
resulting suspension was stirred at overnight until all the start
materials were consumed detected by LC-MS. Then the reaction
mixture was allowed to cool to room temperature and used in the
next step without further purification.
Step 2: Synthesis of (E)-methyl
5-(2-amino-1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)vinyl)pyrazine-2-carbox-
ylate (3)
A solution of (E)-methyl
5-(2-chloro-1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)vinyl)
pyrazine-2-carboxylate (180 mg, 0.45 mmol) in 1,2-dichloroethane
(25 mL) was added a saturated solution of NH.sub.3 in ACN at
0.degree. C., and then the reaction solution was stirred at
0.degree. C. continuously until all the starting materials were
consumed completely. The reaction was quenched by the addition of
H.sub.2O and stirred for 30 min. The aqueous phase was extracted
with ethyl acetate. The organic layers were combined, washed with
brine and dried with Na.sub.2SO.sub.4. The solvent was eliminated
under reduced pressure to give the crude product which was used in
the next step without further purification.
Step 3: Synthesis of (E)-methyl
5-(2-chloro-1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)vinyl)pyrazine-2-carbo-
xylate (4)
A solution of (E)-methyl
5-(2-amino-1-cyano-2-(3,4-dimethoxy-5-nitrophenyl)vinyl)
pyrazine-2-carboxylate (98 mg, 0.25 mmol) in DCM (5 mL) was added
1.0 M solution of BBr.sub.3 in DCM (3 mL, 3 mmol) at -15.degree. C.
under nitrogen atmosphere. The resulting red suspension was stirred
for 1 hour at -15.degree. C. and allowed to warm to room
temperature overnight. The reaction was quenched by the addition of
H.sub.2O (2 mL) and stirred for 30 min. The aqueous phase was
extracted with ethyl acetate (30 mL*3). The organic layers were
combined, washed with brine and dried with Na.sub.2SO.sub.4. The
solvent was eliminated under reduced pressure to give the crude
product. Further purification by Prep-HPLC (0.5% TFA,
MeOH/H.sub.2O) gave the desired product as yellow solid (11 mg,
13%). 1H NMR (400 MHz, DMSO) .delta. 10.96-11.2 (m, 1H), 10.42 (s,
1H), 8.94 (s, 1H), 8.66 (s, 1H), 7.76 (s, 1H), 6.79 (s, 1H). MS
[M+H].sup.+ calcd for C.sub.14H.sub.9N.sub.5O.sub.6 344.0, found
344.0
Compound 701N:
701N was prepared in four synthetic steps from
3,4-dimethoxy-5-nitrobenzoic acid, according to the following
procedure:
##STR00194##
Step 1: Synthesis of
(Z)-2-(azetidine-1-carbonyl)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxyacr-
ylonitrile (3)
Under a nitrogen atmosphere, SOCl.sub.2 (0.38 mL, 5.28 mmol) and
anhydrous DMF (0.01 mL, 0.22 mmol) were added to a suspension of
3,4-dimethoxy-5-nitrobenzoic acid (500 mg, 2.2 mmol) in toluene (10
mL) at room temperature. The mixture was heated at 60.degree. C.
and stirred for 15 hours. The organic solvent was eliminated by
distillation under reduced pressure. More toluene was added and
eliminated again. The resulting yellowish solid
3,4-dimethoxy-5-nitrobenzoyl chloride was dissolved in anhydrous
THF (5 mL).
Under a nitrogen atmosphere, 60% NaH (0.18 g, 4.4 mmol) was added
to the solution of 3-(azetidin-1-yl)-3-oxopropanenitrile (250 mg,
2.0 mmol) in anhydrous THF (5 mL) at -5.degree. C. The resulting
suspension was stirred at -5.degree. C. for 15 min and the solution
of 3,4-dimethoxy-5-nitrobenzoyl chloride in THF was added over 10
min and stirred for an additional 1 hour at -5.degree. C. The
reaction mixture was warmed to 0.degree. C., quenched by the
addition of 1N.HCl solution (4 mL) and stirred for 10 min at room
temperature, extracted by ethyl acetate (25 mL*2), the organic
layers was dried with Na.sub.2SO.sub.4 and concentrated in vacuo to
give the compound 3.
Step 2: Synthesis of
(Z)-2-(azetidine-1-carbonyl)-3-chloro-3-(3,4-dimethoxy-5-nitrophenyl)acry-
lonitrile (4)
A solution of
(Z)-2-(azetidine-1-carbonyl)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxyacr-
ylonitrile (175 mg, 0.5 mmol) in DCM (5 mL) was added PCl.sub.5
(104 mg, 0.5 mmol) at 0.degree. C. The resulting suspension was
stirred at overnight until all the start materials were consumed
detected by LC-MS. Then the reaction mixture was allowed to cool to
room temperature and used in the next step without further
purification.
Step 3: Synthesis of
(Z)-3-amino-2-(azetidine-1-carbonyl)-3-(3,4-dimethoxy-5-nitrophenyl)acryl-
onitrile (5)
A solution of
(Z)-2-(azetidine-1-carbonyl)-3-chloro-3-(3,4-dimethoxy-5-nitrophenyl)acry-
lonitrile (164 mg, 0.5 mmol) in DCM was added a saturated solution
of NH.sub.3 in ACN at 0.degree. C., and then the reaction solution
was stirred at 0.degree. C. continuously until all the starting
materials were consumed completely. The reaction was quenched by
the addition of H.sub.2O and stirred for 30 min. The aqueous phase
was extracted with ethyl acetate. The organic layers were combined,
washed with brine and dried with Na.sub.2SO.sub.4. The solvent was
eliminated under reduced pressure to give the crude product which
was used in the next step without further purification.
Step 4: Synthesis of
(Z)-3-amino-2-(azetidine-1-carbonyl)-3-(3,4-dihydroxy-5-nitrophenyl)acryl-
onitrile (6)
A solution of
(Z)-3-amino-2-(azetidine-1-carbonyl)-3-(3,4-dimethoxy-5-nitrophenyl)acryl-
onitrile (66 mg, 0.2 mmol) in DCM (5 mL) was added 1.0 M solution
of BBr.sub.3 in DCM (1 mL, 1 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of H.sub.2O (2 mL) and
stirred for 30 min. The aqueous phase was extracted with ethyl
acetate (30 mL*3). The organic layers were combined, washed with
brine and dried with Na.sub.2SO.sub.4. The solvent was eliminated
under reduced pressure to give the crude product. Further
purification by Prep-HPLC gave the desired product (7 mg, 12%). 1H
NMR (400 MHz, DMSO) .delta. 10.52 (s, 2H), 9.87 (s, 1H), 7.60 (d,
J=2.1 Hz, 1H), 7.35 (d, J=2.1 Hz, 1H), 4.26 (s, 4H), 2.29 (m, 2H).
MS [M+H].sup.+ calcd for C.sub.13H.sub.13N.sub.4O.sub.5 305.3,
found 305.0
Compound 711N:
711N was prepared in three synthetic steps from
(Z)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(thiazole-4-carbonyl)acry-
lonitrile, according to the following procedure:
##STR00195##
Step 1: Synthesis of
(Z)-3-chloro-3-(3,4-dimethoxy-5-nitrophenyl)-2-(thiazole-4-carbonyl)acryl-
onitrile (2)
A solution of
(Z)-3-(3,4-dimethoxy-5-nitrophenyl)-3-hydroxy-2-(thiazole-4-carbonyl)acry-
lonitrile (150 mg, 0.42 mmol) in 1,2-dichloroethane (25 mL) was
added PCl.sub.5 (86 mg, 0.42 mmol) at 0.degree. C. The resulting
suspension was stirred at overnight until all the start materials
were consumed detected by LC-MS. Then the reaction mixture was
allowed to cool to room temperature and used in the next step
without further purification.
Step 2: Synthesis of
(Z)-3-amino-3-(3,4-dimethoxy-5-nitrophenyl)-2-(thiazole-4-carbonyl)acrylo-
nitrile (3)
A solution of
(Z)-3-chloro-3-(3,4-dimethoxy-5-nitrophenyl)-2-(thiazole-4-carbonyl)acryl-
onitrile (185 mg, 0.42 mmol) in 1,2-dichloroethane (25 mL) was
added a saturated solution of NH.sub.3 in ACN at 0.degree. C., and
then the reaction solution was stirred at 0.degree. C. continuously
until all the starting materials were consumed completely. The
reaction was quenched by the addition of H.sub.2O and stirred for
30 min. The aqueous phase was extracted with ethyl acetate. The
organic layers were combined, washed with brine and dried with
Na.sub.2SO.sub.4. The solvent was eliminated under reduced pressure
to give the crude product which was used in the next step without
further purification. MS [M+H].sup.+ calcd for
C.sub.15H.sub.12N.sub.4O.sub.5S 361.0, found 361.0
Step 3: Synthesis of ammonium
(Z)-5-(1-amino-2-cyano-3-oxo-3-(thiazol-4-yl)prop-1-enyl)-2-hydroxy-3-nit-
rophenolate (4)
A solution of
(Z)-3-amino-3-(3,4-dimethoxy-5-nitrophenyl)-2-(thiazole-4-carbonyl)acrylo-
nitrile (100 mg, 0.28 mmol) in DCM (5 mL) was added 1.0 M solution
of BBr.sub.3 in DCM (1 mL, 1 mmol) at -15.degree. C. under nitrogen
atmosphere. The resulting red suspension was stirred for 1 hour at
-15.degree. C. and allowed to warm to room temperature overnight.
The reaction was quenched by the addition of 0.5 N.NH.sub.4OH (2
mL) and stirred for 5 min. The aqueous phase was washed with ethyl
acetate. The hydrous layer was eliminated under reduced pressure to
give the crude product. Further purification by Prep-HPLC (0.05%
FA, MeOH/H.sub.2O) gave the desired product as yellow solid (11 mg,
15%). 1H NMR (400 MHz, DMSO) .delta. 8.85 (s, 1H), 7.66 (s, 1H),
7.38 (s, 1H), 6.80-6.99 (m, 1H), 6.66-6.74 (m, 1H). MS [M+H].sup.+
calcd for C.sub.13H.sub.11N.sub.5O.sub.5S 333.0, found 333.0
Compound 347M:
347M was prepared in three synthetic steps from
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-hydroxyacrylamide
according to the following procedure:
##STR00196##
Step 1: Synthesis of
2-cyano-3-(diethylamino)-1-(3,4-dimethoxy-5-nitrophenyl)-3-oxoprop-1-enyl
methanesulfonate (2)
A solution of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-hydroxyacrylamide
(350 mg, 1 mmol) and Et.sub.3N (202 mg, 2 mmol) in DCM (15 mL) was
added MsCl (250 mg, 2 mmol) at 0.degree. C. The reaction solution
was stirred at rt for 3 h, then it was concentrated in vacuo to
afford the crude product (360 mg), which was used in the next step
without further purification.
Step 2: Synthesis of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-(methylamino)acryla-
mide (3)
A solution of
2-cyano-3-(diethylamino)-1-(3,4-dimethoxy-5-nitrophenyl)-3-oxoprop-1-enyl
methanesulfonate (250 mg, 0.7 mmol) and K.sub.2CO.sub.3 (193 mg,
1.4 mmol) in MeCN (10 mL) was added MeNH.sub.2 (1.4 mmol, 0.7 mL,
2N in THF) at rt. The reaction solution was refluxed for 2 h, and
then 50 mL of water was added. The aqueous phase was extracted by
EA for two times (50 mL.times.2), and then the organic layer was
concentrated in vacuo to afford the crude product (210 mg), which
was used in the next step without further purification. MS
[M+H].sup.+ calcd for C.sub.17H.sub.22N.sub.4O.sub.5 363.1, found
363.1.
Step 3: Synthesis of
2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl-3-(methylamino)acryla-
mide (4)
A solution of
2-cyano-3-(3,4-dimethoxy-5-nitrophenyl)-N,N-diethyl-3-(methylamino)acryla-
mide (210 mg, 0.58 mmol) in DCM (5 mL) was added 1.0 M solution of
BBr.sub.3 in DCM (2 mL, 2 mmol) at -15.degree. C. under nitrogen
atmosphere. The reaction solution was stirred at -15.degree. C. for
1 h then at room temperature overnight. The reaction was quenched
by the addition of H.sub.2O (2 mL) and stirred for 30 min. The
aqueous phase was extracted by ethyl acetate for three times (30
mL.times.3). The organic layer was washed with brine and dried over
Na.sub.2SO.sub.4, then it was concentrated in vacuo to afford the
crude product, which was purified by Prep-HPLC (0.5% TFA,
MeOH/H.sub.2O) to gain the desired product as bright yellow solid
(25 mg, 13%). MS .sup.1H NMR (400 MHz, DMSO) .delta. 10.69 (s, 2H),
7.43 (s, 1H), 7.20 (s, 1H), 3.40-3.43 (m, 4H), 2.69 (d, J=4.9 Hz,
3H), 1.14 (t, J=6.8 Hz, 13H), 1.14 (t, J=6.8 Hz, 3H). [M+H].sup.+
calcd for C.sub.12H.sub.7N.sub.5O.sub.6S 350.0, found 350.0.
Enzymatic Inhibition.
We measured compound inhibition activity in a demethylation
reaction catalyzed by FTO (US2014/0148383A1). The reaction system
was incubated at 37.degree. C. for 2 h and stopped by heating at
95.degree. C. for 5 min. ssDNA was digested by nuclease P1 and
alkaline phosphatase. The concentrations of N.sup.6-mA and A were
analyzed by HPLC-MS/MS. When concentration of substrate and enzyme
are 0.5 .mu.M and 0.1 .mu.M, respectively, the measured IC.sub.50
value of entacapone against FTO is .about.3 .mu.M. The compounds of
Tables 1-3 were consistently active, with IC.sub.50's less than 10
.mu.M, and most less than 1 .mu.M.
TABLE-US-00006 Exemplary IC50 Data of submicromolar representative
compounds Compound No. Enzymatic inhibition (IC50) .mu.M 687 <1
317 >1 371 ~1 660 <1 382 >1 702 ~1 698 >1 675 >1 394
>1 664 ~1 684 >1 688 >1 713 <1 709 <1 712 ~1 693 ~1
331 ~1 333 >1 318 ~1 365 ~1 366 >1 390 ~1 656 <1 666 <1
315 ~1 319 <1 389 ~1 502 <1 505 <1 395 <1 396 <1 522
~1 655 <1 518 >1 520 <1 347 <1 351 <1 523 <1 524
~1 525 <1 503 ~1 359 >1 374 <1 668 <1 661 ~1 673 <1
674 >1 691 <1 692 <1 697 <1 701 <1 711 ~1 715 <1
722 <1 347N <1 661N <1 691N ~1 692N >1 697N <1 701N
>1 711N >1 347M ~1
In vivo Anti-Obesity Efficacy.
Male wistar rats (6 weeks) were fed with high-fat diet (45% fat,
OpenSource Diets D12451), and compound (100 mg/kg) was administered
to 12 randomly selected rats by gavage. After 8 weeks, the mean
body weight of drug treatment group was less than that of control
group. However, the body-weight-normalized food intakes of the two
groups showed no difference. The LDL-c (Low Density
Lipoprotein--cholesterol) in serum of drug treatment group was
reduced compared to that of control group, and the adipose and
hepatic tissues of rat in drug-treated groups showed reduced size
of adipose cells and reduced level of liver steatosis.
Atherosclerosis Model: Ldlr-Deficient Mice.
We measured compound anti-atherosclerosis efficacy using
Ldlr.sup.-/- mice fed western style diet (20% fat, 0.15%
cholesterol), compound (100 mg/day) was orally administered by
References